{"id":26389,"date":"2025-04-19T15:31:15","date_gmt":"2025-04-19T07:31:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/26389.html"},"modified":"2025-04-19T15:31:15","modified_gmt":"2025-04-19T07:31:15","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90-eventsource%ef%bc%9a%e5%ae%9e%e7%8e%b0%e9%ab%98%e6%95%88%e6%9c%8d%e5%8a%a1%e5%99%a8%e6%8e%a8%e9%80%81%e7%9a%84%e7%8e%b0%e4%bb%a3%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/26389.html","title":{"rendered":"\u6df1\u5165\u89e3\u6790 EventSource\uff1a\u5b9e\u73b0\u9ad8\u6548\u670d\u52a1\u5668\u63a8\u9001\u7684\u73b0\u4ee3\u65b9\u6848"},"content":{"rendered":"<h3>\u4e00\u3001\u5b9e\u65f6\u901a\u4fe1\u6280\u672f\u6f14\u8fdb\u80cc\u666f<\/h3>\n<h4>1.1 \u4f20\u7edf\u5b9e\u65f6\u901a\u4fe1\u65b9\u6848\u7684\u5c40\u9650<\/h4>\n<p>\u5728 Web 1.0 \u65f6\u4ee3&#xff0c;\u5b9e\u65f6\u6570\u636e\u66f4\u65b0\u4e3b\u8981\u4f9d\u8d56\u4ee5\u4e0b\u6280\u672f&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u77ed\u8f6e\u8be2&#xff08;Short Polling&#xff09;&#xff1a;\u5b9a\u65f6\u53d1\u9001 HTTP \u8bf7\u6c42<\/p>\n<p> <span class=\"token function\">setInterval<\/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 function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/updates&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">res<\/span> <span class=\"token operator\">&#061;&gt;<\/span> res<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/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\">5000<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5b9e\u73b0\u7b80\u5355<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u7f51\u7edc\u8d44\u6e90\u6d6a\u8d39\u3001\u66f4\u65b0\u5ef6\u8fdf\u9ad8<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u957f\u8f6e\u8be2&#xff08;Long Polling&#xff09;&#xff1a;\u4fdd\u6301\u8fde\u63a5\u76f4\u5230\u6570\u636e\u66f4\u65b0<\/p>\n<p> <span class=\"token keyword\">function<\/span> <span class=\"token function\">longPoll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/updates&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">res<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">processData<\/span><span class=\"token punctuation\">(<\/span>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/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 function\">longPoll<\/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><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u51cf\u5c11\u8bf7\u6c42\u6b21\u6570<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u670d\u52a1\u5668\u8fde\u63a5\u8d44\u6e90\u6d88\u8017\u5927<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>1.2 \u73b0\u4ee3\u5b9e\u65f6\u901a\u4fe1\u9700\u6c42<\/h4>\n<ul>\n<li>\u91d1\u878d\u4ea4\u6613\u7cfb\u7edf&#xff1a;\u6beb\u79d2\u7ea7\u884c\u60c5\u66f4\u65b0<\/li>\n<li>\u793e\u4ea4\u5e73\u53f0&#xff1a;\u5b9e\u65f6\u6d88\u606f\u63a8\u9001<\/li>\n<li>IoT \u4eea\u8868\u76d8&#xff1a;\u8bbe\u5907\u72b6\u6001\u5373\u65f6\u540c\u6b65<\/li>\n<li>\u5728\u7ebf\u534f\u4f5c\u5de5\u5177&#xff1a;\u591a\u7528\u6237\u534f\u540c\u64cd\u4f5c<\/li>\n<\/ul>\n<h3>\u4e8c\u3001EventSource \u6838\u5fc3\u6280\u672f\u89e3\u6790<\/h3>\n<h4>2.1 \u534f\u8bae\u89c4\u8303\u4e0e\u5de5\u4f5c\u539f\u7406<\/h4>\n<p>SSE&#xff08;Server-Sent Events&#xff09;\u534f\u8bae\u7279\u5f81&#xff1a;<\/p>\n<ul>\n<li>\u57fa\u4e8e\u6807\u51c6 HTTP\/HTTPS \u534f\u8bae<\/li>\n<li>\u5355\u5411\u901a\u4fe1&#xff1a;\u670d\u52a1\u7aef -&gt; \u5ba2\u6237\u7aef<\/li>\n<li>\u6587\u672c\u6570\u636e\u6d41\u4f20\u8f93<\/li>\n<li>\u9ed8\u8ba4\u652f\u6301\u65ad\u7ebf\u91cd\u8fde<\/li>\n<li>MIME \u7c7b\u578b&#xff1a;text\/event-stream<\/li>\n<\/ul>\n<p>\u901a\u4fe1\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u5ba2\u6237\u7aef\u5efa\u7acb\u6301\u4e45\u5316\u8fde\u63a5<\/li>\n<li>\u670d\u52a1\u7aef\u4fdd\u6301\u8fde\u63a5\u6253\u5f00\u72b6\u6001<\/li>\n<li>\u6570\u636e\u901a\u8fc7\u7279\u5b9a\u683c\u5f0f\u5206\u5757\u53d1\u9001<\/li>\n<li>\u81ea\u52a8\u5904\u7406\u7f51\u7edc\u4e2d\u65ad\u4e0e\u91cd\u8fde<\/li>\n<h4>2.2 \u6838\u5fc3 API \u63a5\u53e3<\/h4>\n<p><span class=\"token keyword\">const<\/span> eventSource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EventSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/stream&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u57fa\u7840\u4e8b\u4ef6\u76d1\u542c<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;New message:&#039;<\/span><span class=\"token punctuation\">,<\/span> event<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u4e8b\u4ef6\u5904\u7406<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;stockUpdate&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/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> data <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">updateChart<\/span><span class=\"token punctuation\">(<\/span>data<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><\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u5904\u7406<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onerror<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">err<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;EventSource failed:&#039;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  eventSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/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><\/p>\n<h4>2.3 \u6570\u636e\u683c\u5f0f\u89c4\u8303<\/h4>\n<p>\u6807\u51c6\u4e8b\u4ef6\u683c\u5f0f&#xff1a;<\/p>\n<p>event: notification<br \/>\ndata: {&#034;type&#034;:&#034;alert&#034;,&#034;content&#034;:&#034;\u7cfb\u7edf\u5347\u7ea7\u901a\u77e5&#034;}<\/p>\n<p>data: \u7b2c\u4e00\u884c\u6570\u636e<br \/>\ndata: \u7b2c\u4e8c\u884c\u6570\u636e<\/p>\n<p>: \u6ce8\u91ca\u884c<br \/>\nretry: 10000<\/p>\n<p>\u5b57\u6bb5\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>event: \u4e8b\u4ef6\u7c7b\u578b&#xff08;\u9ed8\u8ba4 message&#xff09;<\/li>\n<li>data: \u6709\u6548\u8f7d\u8377&#xff08;\u652f\u6301\u591a\u884c&#xff09;<\/li>\n<li>id: \u4e8b\u4ef6 ID&#xff08;\u7528\u4e8e\u65ad\u7ebf\u6062\u590d&#xff09;<\/li>\n<li>retry: \u91cd\u8fde\u65f6\u95f4&#xff08;\u6beb\u79d2&#xff09;<\/li>\n<\/ul>\n<h3>\u4e09\u3001\u670d\u52a1\u7aef\u5b9e\u73b0\u65b9\u6848<\/h3>\n<h4>3.1 Node.js \u5b9e\u73b0\u793a\u4f8b<\/h4>\n<p><span class=\"token keyword\">const<\/span> http <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">require<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;http&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>http<span class=\"token punctuation\">.<\/span><span class=\"token function\">createServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">req<span class=\"token punctuation\">,<\/span> res<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">.<\/span>url <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token string\">&#039;\/stream&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    res<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeHead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token string-property property\">&#039;Content-Type&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;text\/event-stream&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token string-property property\">&#039;Cache-Control&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;no-cache&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token string-property property\">&#039;Connection&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;keep-alive&#039;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5b9a\u65f6\u53d1\u9001\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> count <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> timer <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setInterval<\/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      res<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">data: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token constant\">JSON<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stringify<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">count<\/span><span class=\"token operator\">:<\/span> <span class=\"token operator\">&#043;&#043;<\/span>count <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">\\\\n\\\\n<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/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\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u65ad\u5f00\u5904\u7406<\/span><br \/>\n    req<span class=\"token punctuation\">.<\/span><span class=\"token function\">on<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;close&#039;<\/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 function\">clearInterval<\/span><span class=\"token punctuation\">(<\/span>timer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      res<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/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 punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3.2 \u9ad8\u7ea7\u529f\u80fd\u5b9e\u73b0<\/h4>\n<p>\u65ad\u7ebf\u91cd\u8fde\u63a7\u5236&#xff1a;<\/p>\n<p>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;retry: 5000\\\\n\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e8b\u4ef6 ID \u8ffd\u8e2a&#xff1a;<\/p>\n<p>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">id: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>Date<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">\\\\n<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u591a\u4e8b\u4ef6\u7c7b\u578b\u5206\u53d1&#xff1a;<\/p>\n<p>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">event: system\\\\ndata: {&#034;status&#034;: &#034;OK&#034;}\\\\n\\\\n<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u56db\u3001\u6027\u80fd\u4f18\u5316\u7b56\u7565<\/h3>\n<h4>4.1 \u8fde\u63a5\u7ba1\u7406\u4f18\u5316<\/h4>\n<ul>\n<li>\n<p>\u5fc3\u8df3\u673a\u5236&#xff1a;\u9632\u6b62\u4ee3\u7406\u670d\u52a1\u5668\u8d85\u65f6\u65ad\u5f00<\/p>\n<p> <span class=\"token function\">setInterval<\/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  res<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;: heartbeat\\\\n\\\\n&#039;<\/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\">30000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>\u8fde\u63a5\u6c60\u63a7\u5236&#xff1a;\u9650\u5236\u6700\u5927\u8fde\u63a5\u6570<\/p>\n<p> <span class=\"token keyword\">const<\/span> <span class=\"token constant\">MAX_CONNECTIONS<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> activeConnections <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">checkConnections<\/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>activeConnections <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token constant\">MAX_CONNECTIONS<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    res<span class=\"token punctuation\">.<\/span>statusCode <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">503<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    res<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/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 punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<h4>4.2 \u6570\u636e\u4f20\u8f93\u4f18\u5316<\/h4>\n<ul>\n<li>\n<p>\u4e8c\u8fdb\u5236\u6570\u636e\u4f20\u8f93&#xff08;\u901a\u8fc7 Base64 \u7f16\u7801&#xff09;<\/p>\n<p> <span class=\"token keyword\">const<\/span> buffer <span class=\"token operator\">&#061;<\/span> Buffer<span class=\"token punctuation\">.<\/span><span class=\"token function\">from<\/span><span class=\"token punctuation\">(<\/span>binaryData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">data: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>buffer<span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;base64&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">\\\\n\\\\n<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>\u6570\u636e\u538b\u7f29&#xff1a;\u4f7f\u7528 gzip\/brotli \u538b\u7f29<\/p>\n<p> res<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeHead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token string-property property\">&#039;Content-Encoding&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;gzip&#039;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<\/ul>\n<h3>\u4e94\u3001\u5b89\u5168\u9632\u62a4\u65b9\u6848<\/h3>\n<h4>5.1 \u8eab\u4efd\u9a8c\u8bc1\u673a\u5236<\/h4>\n<p>Cookie \u9a8c\u8bc1&#xff1a;<\/p>\n<p>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeHead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token string-property property\">&#039;Set-Cookie&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;token&#061;encrypted123; Path&#061;\/; HttpOnly&#039;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>JWT \u9a8c\u8bc1&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> token <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span>headers<span class=\"token punctuation\">.<\/span>authorization<span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039; &#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  jwt<span class=\"token punctuation\">.<\/span><span class=\"token function\">verify<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">SECRET_KEY<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  res<span class=\"token punctuation\">.<\/span>statusCode <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">401<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  res<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/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<h4>5.2 \u8de8\u57df\u5b89\u5168\u7b56\u7565<\/h4>\n<p>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeHead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token string-property property\">&#039;Access-Control-Allow-Origin&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;https:\/\/yourdomain.com&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token string-property property\">&#039;Access-Control-Allow-Credentials&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;true&#039;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u516d\u3001\u5178\u578b\u5e94\u7528\u573a\u666f<\/h3>\n<h4>6.1 \u5b9e\u65f6\u65e5\u5fd7\u76d1\u63a7\u7cfb\u7edf<\/h4>\n<p><span class=\"token comment\">\/\/ \u670d\u52a1\u7aef<\/span><br \/>\ntail <span class=\"token operator\">&#8211;<\/span>f access<span class=\"token punctuation\">.<\/span>log <span class=\"token operator\">|<\/span> <span class=\"token keyword\">while<\/span> read line<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">do<\/span><br \/>\n  echo <span class=\"token string\">&#034;data: ${line}\\\\n\\\\n&#034;<\/span><br \/>\ndone<\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token keyword\">const<\/span> logSource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EventSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/logs&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nlogSource<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">appendLog<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.2 \u5b9e\u65f6\u80a1\u7968\u884c\u60c5\u63a8\u9001<\/h4>\n<p><span class=\"token comment\">\/\/ \u6570\u636e\u683c\u5f0f\u4f18\u5316<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;priceUpdate&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/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> data <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">parseFloat<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span>data<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 operator\">!<\/span><span class=\"token function\">isNaN<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">updatePriceChart<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u4e03\u3001\u6027\u80fd\u5bf9\u6bd4\u6d4b\u8bd5<\/h3>\n<h4>7.1 \u5404\u65b9\u6848\u8d44\u6e90\u6d88\u8017\u5bf9\u6bd4<\/h4>\n<table>\n<tr>\u6307\u6807EventSourceWebSocketLong Polling<\/tr>\n<tbody>\n<tr>\n<td>\u8fde\u63a5\u6570<\/td>\n<td>1<\/td>\n<td>1<\/td>\n<td>\u9ad8\u9891\u7387\u53d8\u5316<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u5b58\u5360\u7528<\/td>\n<td>\u4f4e<\/td>\n<td>\u4e2d<\/td>\n<td>\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>CPU \u4f7f\u7528\u7387<\/td>\n<td>5-10%<\/td>\n<td>15-20%<\/td>\n<td>20-30%<\/td>\n<\/tr>\n<tr>\n<td>\u5ef6\u8fdf<\/td>\n<td>&lt;100ms<\/td>\n<td>&lt;50ms<\/td>\n<td>500-2000ms<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>7.2 \u538b\u529b\u6d4b\u8bd5\u6570\u636e<\/h4>\n<ul>\n<li>\u5355\u670d\u52a1\u5668\u652f\u6491\u8fde\u63a5\u6570&#xff1a;\n<ul>\n<li>EventSource: 10,000&#043; \u5e76\u53d1<\/li>\n<li>WebSocket: 5,000-8,000 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WebSocket<\/li>\n<li>\u7b80\u5355\u72b6\u6001\u66f4\u65b0\u91c7\u7528\u8f6e\u8be2<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6027\u80fd\u4f18\u5316\u8981\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u5408\u7406\u8bbe\u7f6e retry \u65f6\u95f4<\/li>\n<li>\u5b9e\u65bd\u8fde\u63a5\u5065\u5eb7\u68c0\u67e5<\/li>\n<li>\u542f\u7528\u6570\u636e\u538b\u7f29<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5b89\u5168\u5b9e\u65bd\u89c4\u8303&#xff1a;<\/p>\n<ul>\n<li>\u5f3a\u5236 HTTPS \u8fde\u63a5<\/li>\n<li>\u5b9e\u65bd\u8bf7\u6c42\u9891\u7387\u9650\u5236<\/li>\n<li>\u4e25\u683c\u9a8c\u8bc1\u6765\u6e90\u5934<\/li>\n<\/ul>\n<\/li>\n<p>\u901a\u8fc7\u5408\u7406\u5e94\u7528 EventSource \u6280\u672f&#xff0c;\u5f00\u53d1\u8005\u53ef\u4ee5\u6784\u5efa\u51fa\u9ad8\u6548\u3001\u53ef\u9760\u7684\u5b9e\u65f6\u6570\u636e\u63a8\u9001\u7cfb\u7edf\u3002\u8be5\u65b9\u6848\u5728\u8d44\u6e90\u6d88\u8017\u3001\u5b9e\u73b0\u590d\u6742\u5ea6\u3001\u6d4f\u89c8\u5668\u517c\u5bb9\u6027\u7b49\u65b9\u9762\u5c55\u73b0\u51fa\u663e\u8457\u4f18\u52bf&#xff0c;\u662f\u73b0\u4ee3 Web \u5e94\u7528\u4e2d\u670d\u52a1\u5668\u63a8\u9001\u573a\u666f\u7684\u7406\u60f3\u9009\u62e9\u3002\u968f\u7740 Web \u6807\u51c6\u7684\u6301\u7eed\u6f14\u8fdb&#xff0c;EventSource \u5c06\u5728\u5b9e\u65f6\u901a\u4fe1\u9886\u57df\u7ee7\u7eed\u53d1\u6325\u91cd\u8981\u4f5c\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb965\u6b21\uff0c\u70b9\u8d5e34\u6b21\uff0c\u6536\u85cf19\u6b21\u3002\u534f\u8bae\u9009\u62e9\u539f\u5219\u5355\u5411\u6570\u636e\u6d41\u4f18\u5148 SSE\u53cc\u5411\u4ea4\u4e92\u9700\u6c42\u4f7f\u7528 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