{"id":63699,"date":"2026-01-22T08:24:32","date_gmt":"2026-01-22T00:24:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/63699.html"},"modified":"2026-01-22T08:24:32","modified_gmt":"2026-01-22T00:24:32","slug":"%e5%b0%8f%e7%99%bd%e4%b9%9f%e8%83%bd%e7%94%bb%e5%87%ba%e7%82%ab%e9%85%b7%e5%85%ad%e8%a7%92%e6%98%9f%ef%bc%9acanvas%e5%ae%9e%e6%88%98%e6%ba%90%e7%a0%81%e7%9b%b4%e6%8e%a5%e6%8a%84","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/63699.html","title":{"rendered":"\u5c0f\u767d\u4e5f\u80fd\u753b\u51fa\u70ab\u9177\u516d\u89d2\u661f\uff1aCanvas\u5b9e\u6218+\u6e90\u7801\u76f4\u63a5\u6284"},"content":{"rendered":"<\/p>\n<h4>\u5c0f\u767d\u4e5f\u80fd\u753b\u51fa\u70ab\u9177\u516d\u89d2\u661f&#xff1a;Canvas\u5b9e\u6218&#043;\u6e90\u7801\u76f4\u63a5\u6284<\/h4>\n<ul>\n<li>\u5c0f\u767d\u4e5f\u80fd\u753b\u51fa\u70ab\u9177\u516d\u89d2\u661f&#xff1a;Canvas\u5b9e\u6218&#043;\u6e90\u7801\u76f4\u63a5\u6284<\/li>\n<li>\n<ul>\n<li>\u4e3a\u5565\u7a81\u7136\u8981\u753b\u516d\u89d2\u661f&#xff1f;\u522b\u95ee&#xff0c;\u95ee\u5c31\u662fUI\u8bbe\u8ba1\u5e08\u53c8\u6574\u6d3b\u4e86<\/li>\n<li>Canvas 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React \u6253\u5305\u4e0a\u7ebf&#xff0c;\u4ea7\u54c1\u7ecf\u7406\u7529\u6765\u4e00\u5f20\u56fe&#xff1a;\u201c\u54e5&#xff0c;\u660e\u5929\u4e0a\u7ebf&#xff0c;\u5c31\u8981\u8fd9\u4e2a\u4f1a\u8f6c\u7684\u516d\u89d2\u661f&#xff0c;\u5e26\u547c\u5438\u706f&#xff0c;\u80fd\u5bfc\u51fa PNG&#xff0c;\u6700\u597d\u8fd8\u80fd\u6279\u91cf\u590d\u5236&#xff0c;\u6027\u80fd\u522b\u5361&#xff0c;\u989c\u8272\u8981\u53ef\u914d\u7f6e&#xff0c;\u8c22\u8c22\u3002\u201d \u6211\u76ef\u7740\u5c4f\u5e55&#xff0c;\u8111\u5b50\u91cc\u53ea\u6709\u4e00\u53e5\u8bdd&#xff1a;\u6211\u8c22\u8c22\u4f60\u5168\u5bb6\u3002<\/p>\n<p>\u53ef\u5410\u69fd\u5f52\u5410\u69fd&#xff0c;\u996d\u8fd8\u662f\u8981\u5403\u3002\u4e8e\u662f\u6211\u628a\u5496\u5561\u7eed\u4e0a&#xff0c;\u6253\u5f00 VSCode&#xff0c;\u51b3\u5b9a\u628a\u8fd9\u6b21\u8e29\u5751\u7684\u5168\u8fc7\u7a0b\u5199\u4e0b\u6765&#xff0c;\u987a\u5e26\u628a\u80fd\u590d\u7528\u7684\u4ee3\u7801\u4e00\u80a1\u8111\u513f\u6253\u5305\u7ed9\u4f60\u3002\u590d\u5236\u7c98\u8d34\u5c31\u80fd\u8dd1&#xff0c;\u6ce8\u91ca\u6bd4\u6211\u9ad8\u4e2d\u65f6\u6284\u7684\u5468\u6770\u4f26\u6b4c\u8bcd\u8fd8\u5bc6&#xff0c;\u8c01\u518d\u8bf4 Canvas \u96be&#xff0c;\u5c31\u628a\u8fd9\u7bc7\u6587\u7ae0\u7cca\u4ed6\u8138\u4e0a\u3002<\/p>\n<hr \/>\n<h3>Canvas \u662f\u5565\u73a9\u610f\u513f&#xff1f;\u5148\u641e\u660e\u767d\u518d\u52a8\u624b<\/h3>\n<p>\u6709\u4e9b\u6559\u7a0b\u4e00\u4e0a\u6765\u5c31\u8ba9\u4f60 getContext(&#039;2d&#039;)&#xff0c;\u7ed3\u679c\u4f60\u8fde\u753b\u5e03\u957f\u5565\u6837\u90fd\u6ca1\u770b\u6e05&#xff0c;\u5c31\u7a00\u91cc\u7cca\u6d82\u5f00\u59cb\u753b\u7ebf&#xff0c;\u753b\u5b8c\u53d1\u73b0\u2014\u2014\u54a6&#xff0c;\u600e\u4e48\u662f\u4e0a\u4e0b\u98a0\u5012\u7684&#xff1f;\u522b\u95ee\u6211\u600e\u4e48\u77e5\u9053&#xff0c;\u6211\u7b2c\u4e00\u6b21\u753b\u7bad\u5934&#xff0c;\u7ed3\u679c\u7bad\u5934\u51b2\u7740\u6211\u81ea\u5df1&#xff0c;\u4eff\u4f5b\u5728\u5632\u7b11&#xff1a;\u4f60\u884c\u4f60\u4e0a\u554a\u3002<\/p>\n<p>\u8bf4\u767d\u4e86&#xff0c;Canvas \u5c31\u662f\u4e00\u5757\u201c\u900f\u660e\u80f6\u7247\u201d&#xff0c;\u4f60\u62ff\u652f JS \u505a\u7684\u201c\u7b14\u201d\u5728\u4e0a\u9762\u4e71\u6d82\u3002\u6d82\u9519\u4e86\u53ea\u80fd\u6574\u5757\u64e6\u6389\u91cd\u753b&#xff0c;\u6ca1\u6709\u201c\u64a4\u56de\u201d\u6309\u94ae&#xff0c;\u50cf\u6781\u4e86\u4eba\u751f\u3002 \u5b83\u6709\u4e24\u4e2a\u5c3a\u5bf8&#xff1a;\u4e00\u4e2a\u662f\u5143\u7d20\u672c\u8eab\u5927\u5c0f&#xff08;width\/height \u5c5e\u6027&#xff09;&#xff0c;\u53e6\u4e00\u4e2a\u662f CSS \u5927\u5c0f\u3002\u5982\u679c\u4f60\u628a\u4e24\u8005\u641e\u6df7&#xff0c;\u5c31\u4f1a\u51fa\u73b0\u201c\u6211\u660e\u660e\u753b\u7684 100px&#xff0c;\u600e\u4e48\u53d8 150px \u4e86\u201d\u7684\u7075\u5f02\u4e8b\u4ef6\u3002\u8bb0\u4f4f\u4e00\u53e5\u8bdd&#xff1a;\u5c5e\u6027\u5c3a\u5bf8\u662f\u753b\u5e03\u50cf\u7d20&#xff0c;CSS \u5c3a\u5bf8\u53ea\u662f\u62c9\u4f38\u663e\u793a\u3002 \u6240\u4ee5\u7b2c\u4e00\u6b65&#xff0c;\u5148\u9501\u6b7b\u753b\u5e03&#xff0c;\u522b\u8ba9\u6d4f\u89c8\u5668\u4e71\u7f29\u653e&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>canvas<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>starCanvas<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>canvas<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token style\"><span class=\"token language-css\"><br \/>\n  <span class=\"token comment\">\/* \u5343\u4e07\u522b\u5728\u8fd9\u91cc\u5199 width\/height&#xff0c;\u4e0d\u7136\u4f60\u4f1a\u54ed *\/<\/span><br \/>\n  <span class=\"token selector\">canvas<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px solid #ddd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> block<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 0 auto<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<hr \/>\n<h3>\u516d\u89d2\u661f\u5230\u5e95\u957f\u5565\u6837&#xff1f;\u6570\u5b66\u539f\u7406\u7b80\u5355\u8bf4\u4e24\u53e5<\/h3>\n<p>\u5c0f\u65f6\u5019\u6211\u4ee5\u4e3a\u661f\u661f\u90fd\u662f\u4e94\u89d2\u7684&#xff0c;\u76f4\u5230 UI \u59b9\u5b50\u7ed9\u6211\u7529\u4e86\u8fd9\u5f20\u56fe&#xff0c;\u6211\u624d\u53d1\u73b0\u81ea\u5df1\u5929\u771f\u5f97\u53ef\u7231\u3002 \u516d\u89d2\u661f\u5176\u5b9e\u5c31\u662f\u4e24\u4e2a\u7b49\u8fb9\u4e09\u89d2\u5f62&#xff0c;\u4e00\u4e2a\u6b63\u7740&#xff0c;\u4e00\u4e2a\u5012\u7740&#xff0c;\u53e0\u5728\u4e00\u8d77&#xff0c;\u50cf\u4e24\u4e2a\u62ab\u8428\u5207\u7247\u4ea4\u53c9\u3002 \u628a\u5706\u5468\u516d\u7b49\u5206&#xff0c;\u5c31\u80fd\u5f97\u5230\u516d\u4e2a\u9876\u70b9\u3002\u7b2c\u4e00\u4e2a\u4e09\u89d2\u5f62\u53d6\u7b2c 0\u30012\u30014 \u4e2a\u70b9&#xff0c;\u7b2c\u4e8c\u4e2a\u4e09\u89d2\u5f62\u53d6\u7b2c 1\u30013\u30015 \u4e2a\u70b9&#xff0c;\u5b8c\u4e8b\u513f\u3002 \u89d2\u5ea6\u600e\u4e48\u7b97&#xff1f;\u522b\u88ab\u201c\u5f27\u5ea6\u201d\u5413\u5230&#xff0c;\u4e00\u53e5\u8bdd&#xff1a;\u5f27\u5ea6 &#061; \u89d2\u5ea6 * Math.PI \/ 180\u3002 \u5982\u679c\u4f60\u975e\u8981\u7528\u89d2\u5ea6&#xff0c;\u4e5f\u968f\u4f60&#xff0c;\u53cd\u6b63 Canvas \u53ea\u8ba4\u5f27\u5ea6&#xff0c;\u5c31\u50cf\u540e\u7aef\u53ea\u8ba4 JSON&#xff0c;\u4f60\u4e22 XML \u8fc7\u53bb&#xff0c;\u4ed6\u5185\u5fc3\u662f\u5d29\u6e83\u7684\u3002<\/p>\n<hr \/>\n<h3>\u4ece\u96f6\u5f00\u59cb\u624b\u6413\u4e00\u4e2a\u57fa\u7840\u516d\u89d2\u661f<\/h3>\n<p>\u5148\u628a\u753b\u5e03\u62a2\u8fc7\u6765&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> canvas <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;starCanvas&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> ctx <span class=\"token operator\">&#061;<\/span> canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u63a5\u4e0b\u6765\u5c01\u88c5\u4e00\u4e2a\u201c\u753b\u516d\u89d2\u661f\u201d\u51fd\u6570&#xff0c;\u53c2\u6570\u60f3\u591a\u7ec6\u5c31\u591a\u7ec6&#xff0c;\u53cd\u6b63\u4ee5\u540e\u8001\u677f\u8bf4\u8981\u6539\u989c\u8272&#xff0c;\u4f60\u6539\u4e00\u884c\u6570\u5b57\u5c31\u884c&#xff0c;\u4e0d\u7528\u8fde\u591c\u52a0\u73ed&#xff1a;<\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u753b\u4e00\u4e2a\u516d\u89d2\u661f<br \/>\n * &#064;param {CanvasRenderingContext2D} ctx &#8211; \u753b\u5e03\u4e0a\u4e0b\u6587<br \/>\n * &#064;param {number} cx &#8211; \u4e2d\u5fc3 x<br \/>\n * &#064;param {number} cy &#8211; \u4e2d\u5fc3 y<br \/>\n * &#064;param {number} outerRadius &#8211; \u5916\u5708\u534a\u5f84&#xff08;\u5c16\u89d2&#xff09;<br \/>\n * &#064;param {number} [innerRatio&#061;0.5] &#8211; \u5185\u5708\u534a\u5f84\u6bd4\u4f8b&#xff0c;\u8d8a\u5c0f\u8d8a\u7626<br \/>\n * &#064;param {string} [fillStyle&#061;&#039;#f39c12&#039;] &#8211; \u586b\u5145\u8272<br \/>\n * &#064;param {string} [strokeStyle&#061;&#039;#fff&#039;] &#8211; \u63cf\u8fb9\u8272<br \/>\n * &#064;param {number} [lineWidth&#061;2] &#8211; \u7ebf\u5bbd<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  ctx<span class=\"token punctuation\">,<\/span><br \/>\n  cx<span class=\"token punctuation\">,<\/span><br \/>\n  cy<span class=\"token punctuation\">,<\/span><br \/>\n  outerRadius<span class=\"token punctuation\">,<\/span><br \/>\n  innerRatio <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  fillStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#f39c12&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  strokeStyle <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#fff&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  lineWidth <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> angleStep <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 60\u00b0<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4fdd\u5b58\u4e0a\u4e0b\u6587&#xff0c;\u9632\u6b62\u6c61\u67d3<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span>cx<span class=\"token punctuation\">,<\/span> cy<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u628a\u5750\u6807\u7cfb\u539f\u70b9\u79fb\u5230\u661f\u661f\u4e2d\u5fc3&#xff0c;\u540e\u9762\u597d\u7b97<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">beginPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5916\u89d2\u5c16<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> outerAngle <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">*<\/span> angleStep <span class=\"token operator\">&#8211;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4ece\u6b63\u4e0a\u65b9\u5f00\u59cb&#xff0c;\u597d\u770b<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> x1 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">cos<\/span><span class=\"token punctuation\">(<\/span>outerAngle<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerRadius<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> y1 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>outerAngle<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerRadius<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u89d2\u51f9<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> innerAngle <span class=\"token operator\">&#061;<\/span> outerAngle <span class=\"token operator\">&#043;<\/span> angleStep <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> x2 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">cos<\/span><span class=\"token punctuation\">(<\/span>innerAngle<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerRadius <span class=\"token operator\">*<\/span> innerRatio<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> y2 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>innerAngle<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerRadius <span class=\"token operator\">*<\/span> innerRatio<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">moveTo<\/span><span class=\"token punctuation\">(<\/span>x1<span class=\"token punctuation\">,<\/span> y1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span>x1<span class=\"token punctuation\">,<\/span> y1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span>x2<span class=\"token punctuation\">,<\/span> y2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">closePath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u586b\u5145 &amp; \u63cf\u8fb9<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> fillStyle<span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> strokeStyle<span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span>lineWidth <span class=\"token operator\">&#061;<\/span> lineWidth<span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">stroke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u628a\u72b6\u6001\u5f39\u56de\u53bb&#xff0c;\u522b\u5f71\u54cd\u522b\u4eba<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8c03\u7528\u4e00\u4e0b&#xff0c;\u770b\u770b\u6548\u679c&#xff1a;<\/p>\n<p><span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#f39c12&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#fff&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8dd1\u8d77\u6765&#xff0c;\u4e00\u9897\u9ec4\u707f\u707f\u7684\u516d\u89d2\u661f\u5c31\u8eba\u5728\u753b\u5e03\u4e2d\u592e&#xff0c;\u50cf\u6781\u4e86\u4f60\u7b2c\u4e00\u6b21\u8dd1\u901a Hello World \u65f6\u7684\u6fc0\u52a8\u3002 \u5982\u679c\u4f60\u60f3\u753b\u4e2a\u201c\u7626\u661f\u201d&#xff0c;\u5c31\u628a innerRatio \u8c03\u5230 0.3&#xff1b;\u60f3\u753b\u4e2a\u201c\u80d6\u661f\u201d&#xff0c;\u5c31\u62c9\u5230 0.7&#xff0c;\u50cf\u6781\u4e86\u6211\u75ab\u60c5\u671f\u95f4\u7684\u4f53\u91cd\u53d8\u5316\u3002<\/p>\n<hr \/>\n<h3>\u60f3\u6362\u4e2a\u98ce\u683c&#xff1f;\u8bd5\u8bd5\u8fd9\u4e9b\u82b1\u91cc\u80e1\u54e8\u7684\u6837\u5f0f<\/h3>\n<h4>1. \u6e10\u53d8\u586b\u5145<\/h4>\n<p>CSS \u91cc\u5199 linear-gradient \u5f88\u723d&#xff0c;Canvas \u91cc\u4e5f\u4e0d\u5dee&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> grad <span class=\"token operator\">&#061;<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">createLinearGradient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">80<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">80<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ngrad<span class=\"token punctuation\">.<\/span><span class=\"token function\">addColorStop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#ffecd2&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ngrad<span class=\"token punctuation\">.<\/span><span class=\"token function\">addColorStop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#fcb69f&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> grad<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2. \u9634\u5f71\u53d1\u5149<\/h4>\n<p>\u522b\u518d\u7528 box-shadow \u4e86&#xff0c;Canvas \u91cc\u53eb shadowBlur&#xff0c;\u8bb0\u5f97\u753b\u5b8c\u5173\u6389&#xff0c;\u4e0d\u7136\u5168\u573a\u90fd\u662f\u963f\u51e1\u8fbe&#xff1a;<\/p>\n<p>ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>shadowColor <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;rgba(255, 100, 200, 0.8)&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span>shadowBlur <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7528\u5b8c\u7acb\u523b\u5173&#xff0c;\u522b\u50cf\u51b0\u7bb1\u95e8\u4e0d\u5173\u88ab\u5988\u9a82<\/span><\/p>\n<h4>3. \u9542\u7a7a\u6548\u679c<\/h4>\n<p>\u60f3\u8981\u201c\u63cf\u8fb9\u7a7a\u5fc3\u201d&#xff1f;\u628a fill() \u5220\u4e86&#xff0c;\u53ea\u7559 stroke()&#xff0c;\u518d\u8c03\u7c97\u7ebf\u5bbd&#xff0c;\u77ac\u95f4\u9ad8\u51b7\u98ce&#xff1a;<\/p>\n<p><span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;transparent&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#000&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u52a8\u6001\u7ed8\u5236&#xff1f;\u8ba9\u516d\u89d2\u661f\u8f6c\u8d77\u6765\u3001\u7f29\u653e\u3001\u751a\u81f3\u547c\u5438<\/h3>\n<p>\u9759\u6001\u56fe\u8001\u677f\u770b\u4e0d\u4e0a&#xff0c;\u975e\u8981\u201c\u52a8\u753b\u201d\u3002\u884c&#xff0c;\u7ed9\u4ed6\u6574\u4e00\u4e2a\u3002<\/p>\n<h4>\u65cb\u8f6c &#043; \u7f29\u653e<\/h4>\n<p>\u6838\u5fc3\u5c31\u662f requestAnimationFrame &#043; clearRect &#043; \u6539 rotate \u548c scale\u3002 \u5148\u6574\u4e00\u4e2a\u201c\u65cb\u8f6c\u6728\u9a6c\u201d\u7248&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> rotation <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">animate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> cx <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> cy <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span>cx<span class=\"token punctuation\">,<\/span> cy<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">rotate<\/span><span class=\"token punctuation\">(<\/span>rotation<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u753b\u661f\u661f<\/span><br \/>\n  <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#f39c12&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  rotation <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">0.02<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">requestAnimationFrame<\/span><span class=\"token punctuation\">(<\/span>animate<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">animate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u547c\u5438\u706f<\/h4>\n<p>\u628a\u534a\u5f84\u505a\u6210\u6b63\u5f26\u6ce2\u52a8&#xff0c;\u50cf\u71ac\u591c\u7a0b\u5e8f\u5458\u7684\u5fc3\u8df3&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> frame <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">breathe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> scale <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>frame <span class=\"token operator\">*<\/span> <span class=\"token number\">0.05<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">0.1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0.9 ~ 1.1<\/span><br \/>\n  <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span> <span class=\"token operator\">*<\/span> scale<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  frame<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">requestAnimationFrame<\/span><span class=\"token punctuation\">(<\/span>breathe<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">breathe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u7ec4\u5408\u6280&#xff1a;\u65cb\u8f6c &#043; \u547c\u5438 &#043; \u53d8\u8272<\/h4>\n<p>\u628a\u4e0a\u9762\u4ee3\u7801\u63c9\u4e00\u8d77&#xff0c;\u518d\u52a0\u4e2a HSL \u8272\u76f8\u6f02\u79fb&#xff0c;\u8001\u677f\u770b\u4e86\u76f4\u547c\u201c\u8d5b\u535a\u670b\u514b\u201d&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> hue <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">combo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">rotate<\/span><span class=\"token punctuation\">(<\/span>rotation<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> scale <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>frame <span class=\"token operator\">*<\/span> <span class=\"token number\">0.05<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">0.1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> color <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">hsl(<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>hue<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, 80%, 60%)<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span> <span class=\"token operator\">*<\/span> scale<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  rotation <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">0.02<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  frame<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  hue <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>hue <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">%<\/span> <span class=\"token number\">360<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">requestAnimationFrame<\/span><span class=\"token punctuation\">(<\/span>combo<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">combo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u6027\u80fd\u522b\u7ffb\u8f66&#xff1a;\u6279\u91cf\u753b\u51e0\u5341\u4e2a\u516d\u89d2\u661f\u600e\u4e48\u529e&#xff1f;<\/h3>\n<p>\u8001\u677f\u7a81\u7136\u8bf4&#xff1a;\u201c\u4e00\u9897\u4e0d\u591f&#xff0c;\u6211\u8981\u4e00\u5c4f&#xff0c;\u6700\u597d 60fps&#xff0c;\u624b\u673a\u4e5f\u4e0d\u80fd\u5361\u3002\u201d \u4f60\u5fc3\u91cc\u9a82\u5a18&#xff0c;\u624b\u4e0a\u8fd8\u662f\u5f97\u5199\u3002 \u8bb0\u4f4f\u4e09\u53e5\u8bdd&#xff1a;<\/p>\n<li>\u522b\u6bcf\u5e27 new \u5bf9\u8c61&#xff0c;GC \u4f1a\u6740\u4f60\u3002<\/li>\n<li>\u79bb\u5c4f\u7f13\u5b58&#xff0c;\u753b\u4e00\u6b21&#xff0c;\u590d\u5236\u65e0\u6570\u3002<\/li>\n<li>\u53ea\u91cd\u7ed8\u53d8\u5316\u533a\u57df&#xff0c;\u5168\u5c4f clearRect \u662f\u5962\u4f88\u3002<\/li>\n<h4>\u79bb\u5c4f\u7f13\u5b58\u6a21\u677f<\/h4>\n<p><span class=\"token comment\">\/\/ 1. \u79bb\u5c4f canvas&#xff0c;\u5185\u5b58\u91cc\u753b\u597d<\/span><br \/>\n<span class=\"token keyword\">const<\/span> off <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;canvas&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\noff<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">&#061;<\/span> off<span class=\"token punctuation\">.<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">120<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6bd4\u661f\u661f\u5927\u4e00\u70b9<\/span><br \/>\n<span class=\"token keyword\">const<\/span> offCtx <span class=\"token operator\">&#061;<\/span> off<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span>offCtx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;#f39c12&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u753b\u4e00\u6b21<\/span><br \/>\n<span class=\"token comment\">\/\/ 2. \u4e3b\u5c4f\u53ea\u8d1f\u8d23 drawImage<\/span><br \/>\n<span class=\"token keyword\">const<\/span> stars <span class=\"token operator\">&#061;<\/span> Array<span class=\"token punctuation\">.<\/span><span class=\"token function\">from<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">length<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">50<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token literal-property property\">x<\/span><span class=\"token operator\">:<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token literal-property property\">y<\/span><span class=\"token operator\">:<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token literal-property property\">vx<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span>Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token literal-property property\">vy<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span>Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token literal-property property\">scale<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">0.5<\/span> <span class=\"token operator\">&#043;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token literal-property property\">rotation<\/span><span class=\"token operator\">:<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  stars<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">s<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    s<span class=\"token punctuation\">.<\/span>x <span class=\"token operator\">&#043;&#061;<\/span> s<span class=\"token punctuation\">.<\/span>vx<span class=\"token punctuation\">;<\/span><br \/>\n    s<span class=\"token punctuation\">.<\/span>y <span class=\"token operator\">&#043;&#061;<\/span> s<span class=\"token punctuation\">.<\/span>vy<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span>x <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> s<span class=\"token punctuation\">.<\/span>x <span class=\"token operator\">&gt;<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">)<\/span> s<span class=\"token punctuation\">.<\/span>vx <span class=\"token operator\">*&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span>y <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> s<span class=\"token punctuation\">.<\/span>y <span class=\"token operator\">&gt;<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span> s<span class=\"token punctuation\">.<\/span>vy <span class=\"token operator\">*&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span>x<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">rotate<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span>rotation<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">scale<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span>scale<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>scale<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">drawImage<\/span><span class=\"token punctuation\">(<\/span>off<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">60<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">60<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u628a\u79bb\u5c4f canvas \u5f53\u7d20\u6750\u8d34\u8fc7\u6765<\/span><br \/>\n    ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">requestAnimationFrame<\/span><span class=\"token punctuation\">(<\/span>move<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e0a\u9762\u8fd9\u6bb5&#xff0c;50 \u9897\u661f\u661f&#xff0c;\u624b\u673a\u8001\u5e74\u4ee3\u6b65\u673a\u90fd\u80fd\u8dd1 60fps\u3002 \u5982\u679c\u4f60\u518d\u72e0\u4e00\u70b9&#xff0c;\u53ef\u4ee5\u7528 requestIdleCallback \u5206\u5e27\u66f4\u65b0\u4f4d\u7f6e&#xff0c;\u6216\u8005\u4e0a WebGL&#xff0c;\u4f46\u90a3\u5c31\u5c5e\u4e8e\u201c\u5377\u738b\u201d\u9886\u57df\u4e86&#xff0c;\u672c\u6587\u4e0d\u5377\u3002<\/p>\n<hr \/>\n<h3>\u8c03\u8bd5\u65f6\u661f\u661f\u753b\u6b6a\u4e86&#xff1f;\u5e38\u89c1\u7ffb\u8f66\u73b0\u573a\u548c\u81ea\u6551\u6307\u5357<\/h3>\n<li>\n<p>\u5750\u6807\u7cfb\u4e0a\u4e0b\u98a0\u5012 \u4f60\u53d1\u73b0\u661f\u661f\u5012\u7740\u957f&#xff0c;\u516b\u6210\u662f translate \u4e4b\u540e\u5fd8\u4e86 rotate \u65b9\u5411&#xff0c;\u6216\u8005 Math.sin \u7528\u53cd\u4e86\u3002Canvas \u7684 Y \u8f74\u5411\u4e0b&#xff0c;\u4e0d\u662f\u5411\u4e0a&#xff0c;\u8bb0\u5f97\u521d\u4e2d\u6570\u5b66\u8001\u5e08\u7684\u5fe0\u544a\u5417&#xff1f;<\/p>\n<\/li>\n<li>\n<p>\u8def\u5f84\u6ca1\u95ed\u5408 \u5c11\u5199\u4e86 closePath()&#xff0c;\u7ed3\u679c\u661f\u661f\u7f3a\u4e00\u6761\u8fb9&#xff0c;\u50cf\u88ab\u8001\u9f20\u5543\u4e86\u4e00\u53e3\u3002 \u89e3\u51b3&#xff1a;\u753b\u5b8c lineTo \u6700\u540e\u56de\u5230\u8d77\u70b9&#xff0c;\u6216\u8005\u76f4\u63a5 closePath()&#xff0c;\u4e00\u952e\u56de\u5bb6\u3002<\/p>\n<\/li>\n<li>\n<p>\u89d2\u5ea6\u5355\u4f4d\u7528\u9519 rotate(30) \u4f60\u4ee5\u4e3a 30\u00b0&#xff0c;\u5b9e\u9645\u4e0a Canvas \u76f4\u63a5\u5f53\u6210 30 \u5f27\u5ea6&#xff0c;\u661f\u661f\u8f6c\u5f97\u6bd4\u98ce\u6247\u8fd8\u5feb\u3002 \u89e3\u51b3&#xff1a;\u7edf\u4e00\u7528 angle * Math.PI \/ 180&#xff0c;\u6216\u8005\u5199\u4e2a\u5de5\u5177\u51fd\u6570&#xff1a;<\/p>\n<p> <span class=\"token keyword\">const<\/span> <span class=\"token function-variable function\">DEG<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token parameter\">d<\/span> <span class=\"token operator\">&#061;&gt;<\/span> d <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">180<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">rotate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">DEG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">30<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>\u72b6\u6001\u6c61\u67d3 \u4f60\u753b\u5b8c\u661f\u661f&#xff0c;\u4e0b\u4e00\u5e27\u6574\u4e2a\u753b\u5e03\u90fd\u5e26\u95ea\u7c89&#xff0c;\u539f\u56e0\u662f shadowBlur \u6ca1\u5173\u3002 \u89e3\u51b3&#xff1a;\u6c38\u8fdc\u6210\u5bf9\u51fa\u73b0 save() \u548c restore()&#xff0c;\u50cf\u7a7f\u889c\u5b50&#xff0c;\u522b\u53ea\u7a7f\u4e00\u53ea\u3002<\/p>\n<\/li>\n<hr \/>\n<h3>\u5f00\u53d1\u8001\u9e1f\u79c1\u85cf\u6280\u5de7&#xff1a;\u5c01\u88c5\u6210\u7ec4\u4ef6\u3001\u652f\u6301\u914d\u7f6e\u3001\u8fd8\u80fd\u5bfc\u51fa\u56fe\u7247<\/h3>\n<p>\u5199\u5230\u8fd9\u513f&#xff0c;\u4f60\u5df2\u7ecf\u53ef\u4ee5\u753b\u661f\u661f\u3001\u505a\u52a8\u753b\u3001\u9632\u6027\u80fd\u7ffb\u8f66\u3002\u4f46\u8001\u677f\u53c8\u63d0\u9700\u6c42&#xff1a;\u201c\u80fd\u4e0d\u80fd\u50cf Ant Design \u4e00\u6837&#xff0c;\u4e00\u53e5 &lt;star color&#061;&#034;#f00&#034; size&#061;&#034;100&#034; spin \/&gt; \u5c31\u80fd\u7528&#xff1f;\u201d \u884c&#xff0c;\u7ed9\u4ed6\u6574\u4e00\u4e2a Web Component&#xff0c;\u4e0d\u7528 React&#xff0c;\u4e0d\u7528 Vue&#xff0c;\u539f\u751f\u5c31\u80fd\u8dd1&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HexStar<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HTMLElement<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">get<\/span> <span class=\"token function\">observedAttributes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;size&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;color&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;spin&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;export&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;canvas&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> shadow <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">attachShadow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">mode<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;open&#039;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    shadow<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token function\">connectedCallback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">render<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">hasAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;spin&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">startSpin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token function\">attributeChangedCallback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">render<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token function\">render<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">parseInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;size&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token string\">&#039;100&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>height <span class=\"token operator\">&#061;<\/span> size<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> color <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;color&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token string\">&#039;#f39c12&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">,<\/span> size <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> size <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> size <span class=\"token operator\">*<\/span> <span class=\"token number\">0.4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token function\">startSpin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> r <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token function-variable function\">spin<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>height <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">rotate<\/span><span class=\"token punctuation\">(<\/span>r<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">const<\/span> color <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;color&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token string\">&#039;#f39c12&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">*<\/span> <span class=\"token number\">0.4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      r <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">0.02<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">requestAnimationFrame<\/span><span class=\"token punctuation\">(<\/span>spin<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">spin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u5bfc\u51fa PNG&#xff0c;\u8001\u677f\u6700\u7231<\/span><br \/>\n  <span class=\"token function\">exportPNG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDataURL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;image\/png&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\ncustomElements<span class=\"token punctuation\">.<\/span><span class=\"token function\">define<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;hex-star&#039;<\/span><span class=\"token punctuation\">,<\/span> HexStar<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7528\u7684\u65f6\u5019&#xff0c;\u8ddf\u5199 HTML \u4e00\u6837\u968f\u610f&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>hex-star<\/span> <span class=\"token attr-name\">size<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>200<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">color<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>#ff0066<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">spin<\/span> <span class=\"token attr-name\">export<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>hex-star<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n  <span class=\"token keyword\">const<\/span> star <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;hex-star&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u4e09\u79d2\u540e\u4e0b\u8f7d<\/span><br \/>\n  <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> link <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;a&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    link<span class=\"token punctuation\">.<\/span>download <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;star.png&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    link<span class=\"token punctuation\">.<\/span>href <span class=\"token operator\">&#061;<\/span> star<span class=\"token punctuation\">.<\/span><span class=\"token function\">exportPNG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    link<span class=\"token punctuation\">.<\/span><span class=\"token function\">click<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u5c01\u88c5\u5b8c&#xff0c;\u4f60\u53ef\u4ee5&#xff1a;<\/p>\n<ul>\n<li>\u4f20\u53c2\u8c03\u989c\u8272\u3001\u5927\u5c0f\u3001\u52a8\u753b&#xff1b;<\/li>\n<li>\u4e00\u952e\u5bfc\u51fa PNG&#xff0c;\u53d1\u7ed9\u8bbe\u8ba1\u5e08\u505a PPT&#xff1b;<\/li>\n<li>\u76f4\u63a5\u4e22 CDN&#xff0c;\u5168\u516c\u53f8\u590d\u7528&#xff0c;\u5e74\u7ec8\u603b\u7ed3\u5199\u201c\u6c89\u6dc0\u901a\u7528\u7ec4\u4ef6\u201d&#xff0c;\u7ee9\u6548\u7a33\u4e86\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u9644\u8d60\u53ef\u76f4\u63a5\u8dd1\u7684\u5b8c\u6574\u6e90\u7801&#xff08;\u5e26\u6ce8\u91ca\u7248&#xff09;<\/h3>\n<p>\u4e0b\u9762\u8fd9\u4efd\u4ee3\u7801&#xff0c;\u590d\u5236\u7c98\u8d34\u5230\u672c\u5730 index.html&#xff0c;\u53cc\u51fb\u5373\u53ef\u8dd1\u3002\u6ce8\u91ca\u6bd4\u6211\u5927\u5b66\u65f6\u6284\u7684\u9ad8\u6570\u7b14\u8bb0\u8fd8\u7ec6&#xff0c;\u8c01\u518d\u8bf4\u770b\u4e0d\u61c2&#xff0c;\u5c31\u628a\u7535\u8111\u9001\u4ed6&#xff1a;<\/p>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">doctype<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span> <span class=\"token attr-name\">lang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>zh-cn<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">charset<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>utf-8<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u516d\u89d2\u661f\u5168\u5bb6\u6876<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token style\"><span class=\"token language-css\"><br \/>\n    <span class=\"token selector\">body<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #f7f7f7<span class=\"token punctuation\">;<\/span> <span class=\"token property\">display<\/span><span class=\"token punctuation\">:<\/span> flex<span class=\"token punctuation\">;<\/span> <span class=\"token property\">flex-direction<\/span><span class=\"token punctuation\">:<\/span> column<span class=\"token punctuation\">;<\/span> <span class=\"token property\">align-items<\/span><span class=\"token punctuation\">:<\/span> center<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token selector\">canvas<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token property\">background<\/span><span class=\"token punctuation\">:<\/span> #fff<span class=\"token punctuation\">;<\/span> <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span> <span class=\"token property\">box-shadow<\/span><span class=\"token punctuation\">:<\/span> 0 2px 8px <span class=\"token function\">rgba<\/span><span class=\"token punctuation\">(<\/span>0<span class=\"token punctuation\">,<\/span>0<span class=\"token punctuation\">,<\/span>0<span class=\"token punctuation\">,<\/span>.1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token selector\">button<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token property\">margin<\/span><span class=\"token punctuation\">:<\/span> 10px<span class=\"token punctuation\">;<\/span> <span class=\"token property\">padding<\/span><span class=\"token punctuation\">:<\/span> 6px 12px<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n  <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>canvas<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>stage<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">width<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">height<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>400<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>canvas<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>exportBtn<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5bfc\u51fa PNG<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n    <span class=\"token comment\">\/\/ \u5de5\u5177&#xff1a;\u89d2\u5ea6\u8f6c\u5f27\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token function-variable function\">DEG<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token parameter\">d<\/span> <span class=\"token operator\">&#061;&gt;<\/span> d <span class=\"token operator\">*<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">180<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u753b\u516d\u89d2\u661f\u51fd\u6570&#xff0c;\u8d85\u5168\u53c2\u6570\u7248<\/span><br \/>\n    <span class=\"token keyword\">function<\/span> <span class=\"token function\">drawSixStar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">ctx<span class=\"token punctuation\">,<\/span> cx<span class=\"token punctuation\">,<\/span> cy<span class=\"token punctuation\">,<\/span> outerR<span class=\"token punctuation\">,<\/span> innerRatio <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">,<\/span> fill<span class=\"token punctuation\">,<\/span> stroke<span class=\"token punctuation\">,<\/span> lineW<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">const<\/span> step <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span>cx<span class=\"token punctuation\">,<\/span> cy<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">beginPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> outerA <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">*<\/span> step <span class=\"token operator\">&#8211;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4ece\u5934\u9876\u5f00\u59cb<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> x1 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">cos<\/span><span class=\"token punctuation\">(<\/span>outerA<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerR<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> y1 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>outerA<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerR<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> innerA <span class=\"token operator\">&#061;<\/span> outerA <span class=\"token operator\">&#043;<\/span> step <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> x2 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">cos<\/span><span class=\"token punctuation\">(<\/span>innerA<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerR <span class=\"token operator\">*<\/span> innerRatio<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> y2 <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>innerA<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> outerR <span class=\"token operator\">*<\/span> innerRatio<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">moveTo<\/span><span class=\"token punctuation\">(<\/span>x1<span class=\"token punctuation\">,<\/span> y1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span>x1<span class=\"token punctuation\">,<\/span> y1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">lineTo<\/span><span class=\"token punctuation\">(<\/span>x2<span class=\"token punctuation\">,<\/span> y2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">closePath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fill<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> ctx<span class=\"token punctuation\">.<\/span>fillStyle <span class=\"token operator\">&#061;<\/span> fill<span class=\"token punctuation\">;<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>stroke<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> ctx<span class=\"token punctuation\">.<\/span>strokeStyle <span class=\"token operator\">&#061;<\/span> stroke<span class=\"token punctuation\">;<\/span> ctx<span class=\"token punctuation\">.<\/span>lineWidth <span class=\"token operator\">&#061;<\/span> lineW<span class=\"token punctuation\">;<\/span> ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">stroke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">restore<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u52a8\u753b&#xff1a;\u65cb\u8f6c &#043; \u547c\u5438 &#043; \u8272\u76f8\u6f02\u79fb<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> canvas <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;stage&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> ctx <span class=\"token operator\">&#061;<\/span> canvas<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;2d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> frame <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">function<\/span> <span class=\"token function\">animate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearRect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span> canvas<span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">const<\/span> scale <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">sin<\/span><span class=\"token punctuation\">(<\/span>frame <span class=\"token operator\">*<\/span> <span class=\"token number\">0.05<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">0.1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">const<\/span> hue <span class=\"token operator\">&#061;<\/span> frame <span class=\"token operator\">%<\/span> <span class=\"token number\">360<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">const<\/span> color <span class=\"token operator\">&#061;<\/span> <span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">hsl(<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>hue<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, 80%, 60%)<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">translate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      ctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">rotate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">DEG<\/span><span class=\"token punctuation\">(<\/span>frame <span class=\"token operator\">*<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token 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