{"id":4874,"date":"2025-05-31T13:32:20","date_gmt":"2025-06-04T06:13:20","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4874"},"modified":"2025-06-04T13:32:20","modified_gmt":"2025-06-04T06:13:20","slug":"%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8typescript%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2%e5%87%bd%e6%95%b0typeassertions","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8typescript%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2%e5%87%bd%e6%95%b0typeassertions\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3 TypeScript \u7684\u985e\u578b\u8f49\u63db\uff1a\u63d0\u5347\u4f60\u7684\u958b\u767c\u6548\u7387\uff01"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u4e86\u89e3 TypeScript \u7684\u985e\u578b\u8f49\u63db\uff1a\u63d0\u5347\u4f60\u7684\u958b\u767c\u6548\u7387\uff01<\/h1>\n

TypeScript \u662f\u5fae\u8edf\u958b\u767c\u7684\u4e00\u7a2e JavaScript \u8d85\u96c6\uff0c\u81f4\u529b\u65bc\u589e\u5f37\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u548c\u53ef\u8b80\u6027\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u5e36\u4f60\u6df1\u5165\u4e86\u89e3 TypeScript \u7684\u985e\u578b\u8f49\u63db\u529f\u80fd\uff08type assertions\uff09\uff0c\u5e6b\u52a9\u4f60\u5728\u958b\u767c\u4e2d\u66f4\u9748\u6d3b\u5730\u8655\u7406\u8b8a\u91cf\u985e\u578b\uff0c\u5f9e\u800c\u63d0\u5347\u4f60\u7684\u958b\u767c\u6548\u7387\u3002<\/p>\n

<\/p>\n

\u4ec0\u9ebc\u662f TypeScript \u7684\u985e\u578b\u8f49\u63db\uff1f<\/h2>\n

TypeScript \u7684\u985e\u578b\u8f49\u63db\uff08type assertions\uff09\u5141\u8a31\u958b\u767c\u8005\u660e\u78ba\u544a\u8a34\u7de8\u8b6f\u5668\u67d0\u500b\u8b8a\u91cf\u7684\u5177\u9ad4\u985e\u578b\u3002\u9019\u7a2e\u9748\u6d3b\u6027\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u5728\u985e\u578b\u7cfb\u7d71\u4e2d\u66f4\u597d\u5730\u63a7\u5236\u8b8a\u91cf\uff0c\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u985e\u578b\u6aa2\u67e5\u932f\u8aa4\u3002\u4f7f\u7528\u985e\u578b\u8f49\u63db\u53ef\u4ee5\u8b93\u4f60\u5728\u8655\u7406\u4e0d\u540c\u6578\u64da\u985e\u578b\u6642\u66f4\u52a0\u81ea\u5982\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528 TypeScript \u7684\u985e\u578b\u8f49\u63db<\/h2>\n

TypeScript \u63d0\u4f9b\u4e86\u5169\u7a2e\u4e3b\u8981\u7684\u8a9e\u6cd5\u4f86\u9032\u884c\u985e\u578b\u8f49\u63db\uff1a\u4f7f\u7528\u5c16\u62ec\u865f\u548c `as` \u95dc\u9375\u5b57\u3002\u4ee5\u4e0b\u662f\u5169\u7a2e\u7528\u6cd5\u7684\u793a\u4f8b\uff1a<\/p>\n

1. \u4f7f\u7528\u5c16\u62ec\u865f\u8a9e\u6cd5\uff1a
\n“`typescript
\nlet myString: string = “123”;
\nlet myNumber: number = (+myString);
\n“`<\/p>\n

2. \u4f7f\u7528 `as` \u8a9e\u6cd5\uff08\u63a8\u85a6\u7528\u6cd5\uff09\uff1a
\n“`typescript
\nlet myString: string = “456”;
\nlet myNumber: number = +myString as number;
\n“`<\/p>\n

\u5728\u9019\u5169\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u5b57\u7b26\u4e32\u8b8a\u91cf `myString` \u8f49\u63db\u70ba\u6578\u5b57\u8b8a\u91cf `myNumber`\u3002\u6ce8\u610f\u9019\u88e1\u4f7f\u7528\u4e86 `+` \u4f86\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u6578\u5b57\u3002<\/p>\n

TypeScript \u985e\u578b\u8f49\u63db\u7684\u512a\u9ede<\/h2>\n

\u4f7f\u7528 TypeScript \u7684\u985e\u578b\u8f49\u63db\u6709\u4ee5\u4e0b\u5e7e\u500b\u660e\u986f\u7684\u512a\u9ede\uff1a<\/p>\n

– **\u63d0\u9ad8\u4ee3\u78bc\u53ef\u8b80\u6027**\uff1a\u660e\u78ba\u6307\u5b9a\u8b8a\u91cf\u7684\u985e\u578b\uff0c\u4f7f\u5176\u4ed6\u958b\u767c\u8005\u66f4\u5bb9\u6613\u7406\u89e3\u4ee3\u78bc\u529f\u80fd\u3002
\n– **\u6e1b\u5c11\u932f\u8aa4**\uff1a\u901a\u904e\u660e\u78ba\u7684\u985e\u578b\u8f49\u63db\uff0c\u53ef\u4ee5\u907f\u514d\u56e0\u932f\u8aa4\u985e\u578b\u5f15\u8d77\u7684\u904b\u884c\u6642\u932f\u8aa4\u3002
\n– **\u589e\u5f37\u7de8\u8b6f\u5668\u6aa2\u67e5**\uff1a\u985e\u578b\u8f49\u63db\u80fd\u5920\u63d0\u5347\u7de8\u8b6f\u5668\u7684\u985e\u578b\u6aa2\u67e5\u80fd\u529b\uff0c\u8b93\u4f60\u5728\u7de8\u8b6f\u968e\u6bb5\u53ca\u65e9\u767c\u73fe\u554f\u984c\u3002<\/p>\n

\u7e3d\u7d50<\/h2>\n

TypeScript \u7684\u985e\u578b\u8f49\u63db\u529f\u80fd\u662f\u958b\u767c\u8005\u5728\u7de8\u5beb\u4ee3\u78bc\u6642\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u5b83\u8b93\u4f60\u80fd\u5920\u9748\u6d3b\u5730\u8655\u7406\u4e0d\u540c\u985e\u578b\u7684\u6578\u64da\uff0c\u4e26\u6e1b\u5c11\u932f\u8aa4\u7684\u767c\u751f\u3002\u638c\u63e1\u9019\u4e00\u6280\u5de7\u5c07\u5927\u5927\u63d0\u5347\u4f60\u7684\u958b\u767c\u6548\u7387\uff0c\u8b93\u4f60\u5728 TypeScript \u7684\u4e16\u754c\u4e2d\u6e38\u5203\u6709\u9918\u3002\u5feb\u4f86\u8a66\u8a66\u5427\uff01
\n—<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6587\u7ae0\u6458\u8981\uff1aTypeScript\u7c7b\u578b\u8f6c\u6362\u51fd\u6570(typeassertions)\u662f\u4e00\u7a2e\u5f37\u5236\u5c07\u4e00\u500b\u8b8a\u91cf\u7684\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u985e\u578b\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u8b8a\u91cf\uff0c\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528TypeScript\u7c7b\u578b\u8f6c\u6362\u51fd\u6570(typeassertions)\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-4874","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\/pcFK27-1gC","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4874","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=4874"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4874\/revisions"}],"predecessor-version":[{"id":4875,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4874\/revisions\/4875"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4874"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4874"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}