{"id":4806,"date":"2023-01-05T10:26:19","date_gmt":"2023-01-05T02:26:19","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4806"},"modified":"2023-01-05T10:26:19","modified_gmt":"2023-01-05T02:26:19","slug":"%e4%ba%86%e8%a7%a3typescript%e7%b1%bb%e5%9e%8b%e6%96%ad%e8%a8%80%e7%9a%84%e5%8a%9f%e8%83%bd%e8%88%87%e5%84%aa%e9%bb%9e","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e4%ba%86%e8%a7%a3typescript%e7%b1%bb%e5%9e%8b%e6%96%ad%e8%a8%80%e7%9a%84%e5%8a%9f%e8%83%bd%e8%88%87%e5%84%aa%e9%bb%9e\/","title":{"rendered":"\u4e86\u89e3TypeScript\u7c7b\u578b\u65ad\u8a00\u7684\u529f\u80fd\u8207\u512a\u9ede"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"TypeScript, TypeScript \u7c7b\u578b\u65ad\u8a00, Type Assertion\"><\/p>\n<h1>\u4ec0\u9ebc\u662f TypeScript \u7c7b\u578b\u65ad\u8a00(Type Assertion)<\/h1>\n<p>TypeScript \u7c7b\u578b\u65ad\u8a00(Type Assertion)\u662f\u4e00\u7a2e\u6280\u8853\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u4e0d\u6539\u8b8a\u8b8a\u6578\u578b\u5225\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c0d\u8b8a\u6578\u578b\u5225\u9032\u884c\u65b7\u8a00\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u7a0b\u5f0f\u78bc\u4e2d\u6307\u5b9a\u8b8a\u6578\u7684\u578b\u5225\uff0c\u800c\u4e0d\u662f\u8b93 TypeScript \u81ea\u52d5\u63a8\u65b7\u3002<\/p>\n<p>TypeScript \u7c7b\u578b\u65ad\u8a00\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u7a0b\u5f0f\u78bc\u4e2d\u6307\u5b9a\u8b8a\u6578\u7684\u578b\u5225\uff0c\u800c\u4e0d\u662f\u8b93 TypeScript \u81ea\u52d5\u63a8\u65b7\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u7a0b\u5f0f\u78bc\u4e2d\u6307\u5b9a\u8b8a\u6578\u7684\u578b\u5225\uff0c\u800c\u4e0d\u662f\u8b93 TypeScript \u81ea\u52d5\u63a8\u65b7\u3002<\/p>\n<h2>TypeScript \u7c7b\u578b\u65ad\u8a00\u7684\u8a9e\u6cd5<\/h2>\n<p>TypeScript \u7c7b\u578b\u65ad\u8a00\u7684\u8a9e\u6cd5\u6709\u5169\u7a2e\uff1a\u300c\u5c16\u62ec\u865f\u300d\u548c\u300cas\u300d\u95dc\u9375\u5b57\u3002<\/p>\n<h3>\u5c16\u62ec\u865f<\/h3>\n<p>\u5c16\u62ec\u865f\u8a9e\u6cd5\u662f\u6700\u5e38\u7528\u7684 TypeScript \u7c7b\u578b\u65ad\u8a00\u8a9e\u6cd5\uff0c\u5b83\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"line-numbers\">&lt;Type&gt;variable\n<\/code><\/pre>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u8b8a\u6578 <code>myVar<\/code>\uff0c\u5b83\u7684\u578b\u5225\u662f <code>any<\/code>\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u5c16\u62ec\u865f\u8a9e\u6cd5\u5c0d\u5b83\u9032\u884c\u65b7\u8a00\uff1a<\/p>\n<pre><code class=\"line-numbers\">let myVar: any = \"Hello World\";\nlet strLength: number = (&lt;string&gt;myVar).length;\n<\/code><\/pre>\n<h3>as \u95dc\u9375\u5b57<\/h3>\n<p>as \u95dc\u9375\u5b57\u8a9e\u6cd5\u662f\u53e6\u4e00\u7a2e TypeScript \u7c7b\u578b\u65ad\u8a00\u8a9e\u6cd5\uff0c\u5b83\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"line-numbers\">variable as Type\n<\/code><\/pre>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u8b8a\u6578 <code>myVar<\/code>\uff0c\u5b83\u7684\u578b\u5225\u662f <code>any<\/code>\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 as \u95dc\u9375\u5b57\u8a9e\u6cd5\u5c0d\u5b83\u9032\u884c\u65b7\u8a00\uff1a<\/p>\n<pre><code class=\"line-numbers\">let myVar: any = \"Hello World\";\nlet strLength: number = (myVar as string).length;\n<\/code><\/pre>\n<h2>\u7e3d\u7d50<\/h2>\n<p>TypeScript \u7c7b\u578b\u65ad\u8a00(Type Assertion)\u662f\u4e00\u7a2e\u6280\u8853\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u4e0d\u6539\u8b8a\u8b8a\u6578\u578b\u5225\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c0d\u8b8a\u6578\u578b\u5225\u9032\u884c\u65b7\u8a00\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u7a0b\u5f0f\u78bc\u4e2d\u6307\u5b9a\u8b8a\u6578\u7684\u578b\u5225\uff0c\u800c\u4e0d\u662f\u8b93 TypeScript \u81ea\u52d5\u63a8\u65b7\u3002TypeScript \u7c7b\u578b\u65ad\u8a00\u7684\u8a9e\u6cd5\u6709\u5169\u7a2e\uff1a\u300c\u5c16\u62ec\u865f\u300d\u548c\u300cas\u300d\u95dc\u9375\u5b57\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6458\u8981:TypeScript\u7c7b\u578b\u65ad\u8a00\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u4e0d\u6539\u8b8a\u503c\u7684\u60c5\u6cc1\u4e0b\uff0c\u6539\u8b8a\u503c\u7684\u985e\u578b\uff0c\u4ee5\u6eff\u8db3\u958b\u767c\u8005\u7684\u9700\u6c42\u3002\u672c\u6587\u5c07\u4ecb\u7d39TypeScript\u7c7b\u578b\u65ad\u8a00\u7684\u529f\u80fd\u8207\u512a\u9ede\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5b83\u4f86\u63d0\u9ad8\u958b\u767c\u6548\u7387\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[187],"tags":[186],"class_list":["post-4806","post","type-post","status-publish","format-standard","hentry","category-typescript","tag-typescript"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-1fw","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4806","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=4806"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4806\/revisions"}],"predecessor-version":[{"id":4807,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4806\/revisions\/4807"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4806"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}