{"id":67698,"date":"2026-01-29T03:17:08","date_gmt":"2026-01-28T19:17:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/67698.html"},"modified":"2026-01-29T03:17:08","modified_gmt":"2026-01-28T19:17:08","slug":"type-challenges%ef%bc%88ts%e7%b1%bb%e5%9e%8b%e4%bd%93%e6%93%8d%ef%bc%89-3-%e5%ae%9e%e7%8e%b0-omit","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/67698.html","title":{"rendered":"type-challenges\uff08ts\u7c7b\u578b\u4f53\u64cd\uff09: 3 - \u5b9e\u73b0 Omit"},"content":{"rendered":"<h2>3 &#8211; \u5b9e\u73b0 Omit<\/h2>\n<p>by Anthony Fu (&#064;antfu) #\u4e2d\u7b49 #union #built-in<\/p>\n<h3>\u9898\u76ee<\/h3>\n<p>\u4e0d\u4f7f\u7528 Omit \u5b9e\u73b0 TypeScript \u7684 Omit&lt;T, K&gt; \u6cdb\u578b\u3002<\/p>\n<p>Omit \u4f1a\u521b\u5efa\u4e00\u4e2a\u7701\u7565 K \u4e2d\u5b57\u6bb5\u7684 T \u5bf9\u8c61\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoPreview<\/span> <span class=\"token operator\">&#061;<\/span> MyOmit<span class=\"token operator\">&lt;<\/span>Todo<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;title&#039;<\/span><span class=\"token operator\">&gt;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> todo<span class=\"token operator\">:<\/span> TodoPreview <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728 Github \u4e0a\u67e5\u770b&#xff1a;https:\/\/tsch.js.org\/3\/zh-CN<\/p>\n<h3>\u4ee3\u7801<\/h3>\n<p><span class=\"token comment\">\/* _____________ \u4f60\u7684\u4ee3\u7801 _____________ *\/<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">MyOmit<span class=\"token operator\">&lt;<\/span><span class=\"token constant\">T<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">K<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token keyword\">keyof<\/span> <span class=\"token constant\">T<\/span><span class=\"token operator\">&gt;<\/span><\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span> <span class=\"token keyword\">in<\/span> <span class=\"token keyword\">keyof<\/span> <span class=\"token constant\">T<\/span> <span class=\"token keyword\">as<\/span> <span class=\"token constant\">P<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\"><span class=\"token constant\">K<\/span><\/span> <span class=\"token operator\">?<\/span> <span class=\"token builtin\">never<\/span> <span class=\"token operator\">:<\/span> <span class=\"token constant\">P<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">:<\/span> <span class=\"token constant\">T<\/span><span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>T&#xff1a;\u6cdb\u578b\u53c2\u6570&#xff0c;\u4ee3\u8868\u4efb\u610f\u5bf9\u8c61\u7c7b\u578b&#xff1b;<\/li>\n<li>K extends keyof T&#xff1a;\u7ea6\u675f K \u5fc5\u987b\u662f T \u7684\u5c5e\u6027\u540d\u4e4b\u4e00&#xff1b;<\/li>\n<li>[P in keyof T as P extends K ? never : P]&#xff1a;\u6620\u5c04\u7c7b\u578b&#xff0c;\u904d\u5386 T \u7684\u6240\u6709\u5c5e\u6027\u540d P&#xff0c;\u5982\u679c P \u4e0d\u5728 K \u4e2d&#xff0c;\u5219\u4fdd\u7559 P&#xff0c;\u5426\u5219\u79fb\u9664 P\u3002<\/li>\n<li>T[P]&#xff1a;\u7d22\u5f15\u8bbf\u95ee\u7c7b\u578b&#xff0c;\u4ee3\u8868 T \u7c7b\u578b\u4e2d P \u5c5e\u6027\u5bf9\u5e94\u7684\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<h3>\u76f8\u5173\u77e5\u8bc6\u70b9<\/h3>\n<h4>keyof<\/h4>\n<p>keyof \u64cd\u4f5c\u7b26\u7528\u4e8e\u83b7\u53d6\u4e00\u4e2a\u7c7b\u578b&#xff08;\u63a5\u53e3\u3001\u7c7b\u578b\u522b\u540d\u3001\u5bf9\u8c61\u7c7b\u578b\u7b49&#xff09;\u7684\u6240\u6709\u516c\u5171\u5c5e\u6027\u540d&#xff0c;\u5e76\u8fd4\u56de\u8fd9\u4e9b\u5c5e\u6027\u540d\u7ec4\u6210\u7684\u8054\u5408\u7c7b\u578b\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoKeys<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">keyof<\/span> Todo <span class=\"token comment\">\/\/ &#034;title&#034; | &#034;description&#034; | &#034;completed&#034;<\/span><\/p>\n<h4>in<\/h4>\n<p>in \u64cd\u4f5c\u7b26\u7528\u4e8e\u904d\u5386\u8054\u5408\u7c7b\u578b\u4e2d\u7684\u6bcf\u4e2a\u6210\u5458&#xff0c;\u5c06\u5176\u8f6c\u6362\u4e3a\u6620\u5c04\u7c7b\u578b\u7684\u5c5e\u6027\u540d\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoKeys<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;title&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;description&#039;<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoPreview<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span> <span class=\"token keyword\">in<\/span> TodoKeys<span class=\"token punctuation\">]<\/span><span class=\"token operator\">:<\/span> Todo<span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ TodoPreview \u7c7b\u578b\u4e3a&#xff1a;<\/span><br \/>\n<span class=\"token comment\">\/\/ {<\/span><br \/>\n<span class=\"token comment\">\/\/   title: string<\/span><br \/>\n<span class=\"token comment\">\/\/   completed: boolean<\/span><br \/>\n<span class=\"token comment\">\/\/ }<\/span><\/p>\n<h4>as<\/h4>\n<p>as \u662f TS \u91cc\u7684\u7c7b\u578b\u65ad\u8a00&#xff0c;\u624b\u52a8\u544a\u8bc9\u7f16\u8bd1\u5668\u67d0\u4e2a\u503c\u7684\u5177\u4f53\u7c7b\u578b\u3002<\/p>\n<p>as \u4e0d\u4f1a\u505a\u4efb\u4f55\u8fd0\u884c\u65f6\u7684\u7c7b\u578b\u8f6c\u6362&#xff0c;\u6240\u4ee5\u8981\u786e\u4fdd\u4f60\u7684\u65ad\u8a00\u662f\u6b63\u786e\u7684&#xff0c;\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\u3002<\/p>\n<p>\u5e38\u7528\u573a\u666f&#xff1a;<\/p>\n<li>\u57fa\u7840\u7528\u6cd5&#xff1a;\u7ec6\u5316\u5bbd\u6cdb\u7c7b\u578b<\/li>\n<p><span class=\"token comment\">\/\/ \u573a\u666f1&#xff1a;unknown \u7c7b\u578b\u7ec6\u5316&#xff08;\u6700\u5e38\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> value<span class=\"token operator\">:<\/span> <span class=\"token builtin\">unknown<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello TypeScript&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7f16\u8bd1\u5668\u4e0d\u77e5\u9053 value \u662f\u5b57\u7b26\u4e32&#xff0c;\u76f4\u63a5\u8c03\u7528 split \u4f1a\u62a5\u9519<\/span><br \/>\n<span class=\"token comment\">\/\/ value.split(&#034; &#034;); \/\/ \u274c \u62a5\u9519&#xff1a;\u5bf9\u8c61\u7684\u7c7b\u578b\u4e3a &#034;unknown&#034;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7528 as \u65ad\u8a00\u4e3a string&#xff0c;\u5c31\u80fd\u6b63\u5e38\u8c03\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">const<\/span> strValue <span class=\"token operator\">&#061;<\/span> value <span class=\"token keyword\">as<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>strValue<span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u2705 [&#034;Hello&#034;, &#034;TypeScript&#034;]<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u573a\u666f2&#xff1a;\u8054\u5408\u7c7b\u578b\u7ec6\u5316<\/span><br \/>\n<span class=\"token keyword\">type<\/span> <span class=\"token class-name\">NumberOrString<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">number<\/span> <span class=\"token operator\">|<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> numOrStr<span class=\"token operator\">:<\/span> NumberOrString <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;123&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65ad\u8a00\u4e3a string&#xff0c;\u907f\u514d\u8054\u5408\u7c7b\u578b\u7684\u7c7b\u578b\u9650\u5236<\/span><br \/>\n<span class=\"token keyword\">const<\/span> str <span class=\"token operator\">&#061;<\/span> numOrStr <span class=\"token keyword\">as<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u2705 \u5408\u6cd5&#xff08;string \u6709 length \u5c5e\u6027&#xff09;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u573a\u666f3&#xff1a;any \u7c7b\u578b\u7ec6\u5316&#xff08;\u4fee\u590d any \u5bfc\u81f4\u7684\u7c7b\u578b\u4e22\u5931&#xff09;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> anyValue<span class=\"token operator\">:<\/span> <span class=\"token builtin\">any<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">20<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> user <span class=\"token operator\">&#061;<\/span> anyValue <span class=\"token keyword\">as<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">;<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u2705 \u7c7b\u578b\u5b89\u5168&#xff0c;\u7f16\u8f91\u5668\u6709\u81ea\u52a8\u63d0\u793a<\/span><\/p>\n<li>\u975e\u7a7a\u65ad\u8a00&#xff08;as non-null&#xff09;&#xff1a;\u6392\u9664 null\/undefined<\/li>\n<p>TS \u4e5f\u63d0\u4f9b\u4e86\u7b80\u5199 !&#xff0c;\u672c\u8d28\u662f as non-null \u7684\u8bed\u6cd5\u7cd6\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u573a\u666f&#xff1a;\u83b7\u53d6 DOM \u5143\u7d20&#xff08;\u7f16\u8bd1\u5668\u9ed8\u8ba4\u63a8\u65ad\u8fd4\u56de HTMLElement | null&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> el <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\">&#034;app&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u76f4\u63a5\u8bbf\u95ee el.innerHTML \u4f1a\u62a5\u9519&#xff0c;\u56e0\u4e3a el \u53ef\u80fd\u662f null<\/span><br \/>\n<span class=\"token comment\">\/\/ el.innerHTML &#061; &#034;Hello&#034;; \/\/ \u274c \u62a5\u9519&#xff1a;\u5bf9\u8c61\u53ef\u80fd\u4e3a &#034;null&#034;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7528\u6cd51&#xff1a;\u7528 as \u65ad\u8a00\u4e3a\u5177\u4f53\u7684 DOM \u7c7b\u578b&#xff08;\u6392\u9664 null &#043; \u6307\u5b9a\u5177\u4f53\u7c7b\u578b&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> divEl <span class=\"token operator\">&#061;<\/span> el <span class=\"token keyword\">as<\/span> HTMLDivElement<span class=\"token punctuation\">;<\/span><br \/>\ndivEl<span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u2705 \u5408\u6cd5<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7528\u6cd52&#xff1a;\u7b80\u5199 !&#xff08;\u7b49\u4ef7\u4e8e as non-null&#xff09;&#xff0c;\u4ec5\u6392\u9664 null\/undefined<\/span><br \/>\n<span class=\"token keyword\">const<\/span> el2 <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\">&#034;app&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">;<\/span><br \/>\nel2<span class=\"token punctuation\">.<\/span>innerHTML <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;World&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u2705 \u5408\u6cd5<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7528\u6cd53&#xff1a;\u663e\u5f0f\u65ad\u8a00\u4e3a non-null \u7c7b\u578b<\/span><br \/>\n<span class=\"token keyword\">type<\/span> <span class=\"token class-name\">NonNullEl<\/span> <span class=\"token operator\">&#061;<\/span> HTMLElement<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> el3 <span class=\"token operator\">&#061;<\/span> el <span class=\"token keyword\">as<\/span> NonNullEl<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e el as NonNullable&lt;typeof el&gt;<\/span><\/p>\n<li>\u7c7b\u578b\u91cd\u6784 \/ \u63a5\u53e3\u65ad\u8a00<\/li>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u63a5\u53e3<\/span><br \/>\n<span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  name<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  age<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u540e\u7aef\u8fd4\u56de\u7684\u539f\u59cb\u6570\u636e&#xff08;\u7c7b\u578b\u4e3a any&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> rawData <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u674e\u56db&#034;<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">25<\/span><span class=\"token punctuation\">,<\/span> extra<span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u65e0\u5173\u5b57\u6bb5&#034;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65ad\u8a00\u4e3a User \u7c7b\u578b&#xff08;\u5ffd\u7565\u591a\u4f59\u5b57\u6bb5&#xff0c;\u53ea\u6821\u9a8c\u5fc5\u8981\u5b57\u6bb5&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> user<span class=\"token operator\">:<\/span> User <span class=\"token operator\">&#061;<\/span> rawData <span class=\"token keyword\">as<\/span> User<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">,<\/span> user<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u2705 \u7c7b\u578b\u5b89\u5168<\/span><\/p>\n<li>\u6620\u5c04\u7c7b\u578b\u7684\u952e\u91cd\u6620\u5c04: \u4fee\u6539 \/ \u8fc7\u6ee4\u6620\u5c04\u7c7b\u578b\u904d\u5386\u8fc7\u7a0b\u4e2d\u7684\u5c5e\u6027\u540d<\/li>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoKeys<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;title&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;completed&#039;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u573a\u666f&#xff1a;\u8fc7\u6ee4\u6389 description \u5c5e\u6027<\/span><br \/>\n<span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoPreview<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span> <span class=\"token keyword\">in<\/span> TodoKeys <span class=\"token keyword\">as<\/span> <span class=\"token constant\">P<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">?<\/span> <span class=\"token builtin\">never<\/span> <span class=\"token operator\">:<\/span> <span class=\"token constant\">P<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">:<\/span> Todo<span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ TodoPreview \u7c7b\u578b\u4e3a&#xff1a;<\/span><br \/>\n<span class=\"token comment\">\/\/ {<\/span><br \/>\n<span class=\"token comment\">\/\/   title: string<\/span><br \/>\n<span class=\"token comment\">\/\/   completed: boolean<\/span><br \/>\n<span class=\"token comment\">\/\/ }<\/span><\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoKeys<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;title&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;completed&#039;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u628a title \u91cd\u547d\u540d\u4e3a todoTitle&#xff0c;\u8fc7\u6ee4 description<\/span><br \/>\n<span class=\"token keyword\">type<\/span> <span class=\"token class-name\">TodoPreviewRename<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/span> <span class=\"token keyword\">in<\/span> TodoKeys <span class=\"token keyword\">as<\/span> <span class=\"token constant\">P<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token string\">&#039;title&#039;<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#039;todoTitle&#039;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token constant\">P<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">?<\/span> <span class=\"token builtin\">never<\/span> <span class=\"token operator\">:<\/span> <span class=\"token constant\">P<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">:<\/span> Todo<span class=\"token punctuation\">[<\/span><span class=\"token constant\">P<\/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 comment\">\/\/ \u7b49\u4ef7\u4e8e&#xff1a;{ todoTitle: string; completed: boolean }<\/span><\/p>\n<li>\u53cc\u91cd\u65ad\u8a00&#xff08;\u614e\u7528&#xff09;<\/li>\n<p><span class=\"token keyword\">let<\/span> num<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">123<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u76f4\u63a5\u65ad\u8a00\u4e3a boolean \u4f1a\u62a5\u9519&#xff08;\u7c7b\u578b\u4e0d\u517c\u5bb9&#xff09;<\/span><br \/>\n<span class=\"token comment\">\/\/ num as boolean; \/\/ \u274c \u62a5\u9519<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53cc\u91cd\u65ad\u8a00&#xff1a;\u5148\u8f6c any&#xff0c;\u518d\u8f6c boolean&#xff08;\u614e\u7528&#xff01;\u4ec5\u786e\u8ba4\u903b\u8f91\u6b63\u786e\u65f6\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> bool <span class=\"token operator\">&#061;<\/span> num <span class=\"token keyword\">as<\/span> <span class=\"token builtin\">any<\/span> <span class=\"token keyword\">as<\/span> <span class=\"token builtin\">boolean<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>bool<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fd0\u884c\u65f6\u8fd8\u662f 123&#xff0c;\u53ea\u662f\u7f16\u8bd1\u65f6\u7c7b\u578b\u4e3a boolean<\/span><\/p>\n<h3>\u6d4b\u8bd5\u7528\u4f8b<\/h3>\n<p><span class=\"token comment\">\/* _____________ \u6d4b\u8bd5\u7528\u4f8b _____________ *\/<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token keyword\">type<\/span> <span class=\"token punctuation\">{<\/span> Equal<span class=\"token punctuation\">,<\/span> Expect <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;type-challenges\/utils&#039;<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> <span class=\"token class-name\">cases<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n  Expect<span class=\"token operator\">&lt;<\/span>Equal<span class=\"token operator\">&lt;<\/span>Expected1<span class=\"token punctuation\">,<\/span> MyOmit<span class=\"token operator\">&lt;<\/span>Todo<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;description&#039;<\/span><span class=\"token operator\">&gt;&gt;&gt;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  Expect<span class=\"token operator\">&lt;<\/span>Equal<span class=\"token operator\">&lt;<\/span>Expected2<span class=\"token punctuation\">,<\/span> MyOmit<span class=\"token operator\">&lt;<\/span>Todo<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;completed&#039;<\/span><span class=\"token operator\">&gt;&gt;&gt;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  Expect<span class=\"token operator\">&lt;<\/span>Equal<span class=\"token operator\">&lt;<\/span>Expected3<span class=\"token punctuation\">,<\/span> MyOmit<span class=\"token operator\">&lt;<\/span>Todo1<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;completed&#039;<\/span><span class=\"token operator\">&gt;&gt;&gt;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#064;ts-expect-error<\/span><br \/>\n<span class=\"token keyword\">type<\/span> <span class=\"token class-name\">error<\/span> <span class=\"token operator\">&#061;<\/span> MyOmit<span class=\"token operator\">&lt;<\/span>Todo<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;description&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token string\">&#039;invalid&#039;<\/span><span class=\"token operator\">&gt;<\/span><\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Todo1<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">readonly<\/span> title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  description<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Expected1<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n  completed<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Expected2<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Expected3<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">readonly<\/span> title<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u76f8\u5173\u94fe\u63a5<\/h3>\n<p>\u5206\u4eab\u4f60\u7684\u89e3\u7b54&#xff1a;https:\/\/tsch.js.org\/3\/answer\/zh-CN \u67e5\u770b\u89e3\u7b54&#xff1a;https:\/\/tsch.js.org\/3\/solutions \u66f4\u591a\u9898\u76ee&#xff1a;https:\/\/tsch.js.org\/zh-CN<\/p>\n<p>\u4e0b\u9762\u662f\u6211\u7684\u516c\u4f17\u53f7: \u524d\u7aef\u529f\u80fd\u70b9 &#xff0c;\u6b22\u8fce\u5173\u6ce8\u3002<\/p>\n<p>\u5b9e\u6218\u4e3a\u738b&#xff01;\u4e13\u6ce8\u4e8e\u6c47\u603b\u5404\u79cd\u529f\u80fd\u70b9&#xff0c;\u81f4\u529b\u4e8e\u6253\u9020\u4e00\u7cfb\u5217\u80fd\u591f\u5e2e\u52a9\u5de5\u7a0b\u5e08\u5b9e\u73b0\u5404\u79cd\u529f\u80fd\u7684\u60f3\u6cd5\u601d\u8def\u7684\u4f18\u8d28\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>3 &#8211; \u5b9e\u73b0 Omit<br \/>\nby Anthony Fu (antfu) #\u4e2d\u7b49 #union #built-in<br \/>\n\u9898\u76ee<br \/>\n\u4e0d\u4f7f\u7528 Omit \u5b9e\u73b0 TypeScript \u7684 Omit \u6cdb\u578b\u3002<br \/>\nOmit \u4f1a\u521b\u5efa\u4e00\u4e2a\u7701\u7565 K \u4e2d\u5b57\u6bb5\u7684 T \u5bf9\u8c61\u3002<br \/>\n\u4f8b\u5982&#xff1a;<br \/>\ninterface Todo {title: stringdescription: stringcompleted: boolean<br \/>\n}type TodoPreview  MyOmit&lt;Todo, <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7159,568],"topic":[],"class_list":["post-67698","post","type-post","status-publish","format-standard","hentry","category-server","tag-type-challenges","tag-typescript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>type-challenges\uff08ts\u7c7b\u578b\u4f53\u64cd\uff09: 3 - \u5b9e\u73b0 Omit - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/67698.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"type-challenges\uff08ts\u7c7b\u578b\u4f53\u64cd\uff09: 3 - \u5b9e\u73b0 Omit - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"3 - \u5b9e\u73b0 Omit by Anthony Fu (antfu) #\u4e2d\u7b49 #union #built-in \u9898\u76ee \u4e0d\u4f7f\u7528 Omit \u5b9e\u73b0 TypeScript \u7684 Omit \u6cdb\u578b\u3002 Omit \u4f1a\u521b\u5efa\u4e00\u4e2a\u7701\u7565 K \u4e2d\u5b57\u6bb5\u7684 T \u5bf9\u8c61\u3002 \u4f8b\u5982&#xff1a; interface Todo {title: stringdescription: stringcompleted: boolean }type TodoPreview MyOmit&lt;Todo,\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/67698.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta 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