{"id":4850,"date":"2023-01-05T10:58:24","date_gmt":"2023-01-05T02:58:24","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4850"},"modified":"2023-01-05T10:58:24","modified_gmt":"2023-01-05T02:58:24","slug":"%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8typescript%e7%b1%bb%e5%9e%8b%e4%bf%9d%e6%8a%a4%e5%87%bd%e6%95%b0%e4%bf%9d%e8%ad%b7%e4%bd%a0%e7%9a%84%e4%bb%a3%e7%a2%bc","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e5%ad%b8%e7%bf%92%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8typescript%e7%b1%bb%e5%9e%8b%e4%bf%9d%e6%8a%a4%e5%87%bd%e6%95%b0%e4%bf%9d%e8%ad%b7%e4%bd%a0%e7%9a%84%e4%bb%a3%e7%a2%bc\/","title":{"rendered":"\u5b78\u7fd2\u5982\u4f55\u5229\u7528TypeScript\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u4fdd\u8b77\u4f60\u7684\u4ee3\u78bc"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"TypeScript, Type Protection Function\"><\/p>\n<h1>TypeScript \u7c7b\u578b\u4fdd\u62a4\u51fd\u6570(type protection function)<\/h1>\n<p>TypeScript \u662f\u4e00\u7a2e\u7531 Microsoft \u958b\u767c\u7684 JavaScript \u7684\u8d85\u96c6\uff0c\u5b83\u63d0\u4f9b\u4e86\u985e\u578b\u6aa2\u67e5\u529f\u80fd\uff0c\u53ef\u4ee5\u5728\u7de8\u8b6f\u6642\u671f\u6aa2\u67e5\u51fa\u932f\u8aa4\uff0c\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u51fa\u932f\u7684\u6a5f\u6703\u3002TypeScript \u4e2d\u7684\u7a0b\u5f0f\u78bc\u53ef\u4ee5\u88ab\u7de8\u8b6f\u6210\u700f\u89bd\u5668\u53ef\u4ee5\u8b58\u5225\u7684 JavaScript \u7a0b\u5f0f\u78bc\uff0c\u56e0\u6b64\u53ef\u4ee5\u88ab\u700f\u89bd\u5668\u57f7\u884c\u3002<\/p>\n<p>TypeScript \u4e2d\u7684\u7a0b\u5f0f\u78bc\u53ef\u4ee5\u88ab\u7de8\u8b6f\u6210\u700f\u89bd\u5668\u53ef\u4ee5\u8b58\u5225\u7684 JavaScript \u7a0b\u5f0f\u78bc\uff0c\u56e0\u6b64\u53ef\u4ee5\u88ab\u700f\u89bd\u5668\u57f7\u884c\u3002TypeScript \u63d0\u4f9b\u4e86\u4e00\u7a2e\u53eb\u505a\u300c\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570(type protection function)\u300d\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u5728\u7de8\u8b6f\u6642\u671f\u6aa2\u67e5\u51fa\u932f\u8aa4\uff0c\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u51fa\u932f\u7684\u6a5f\u6703\u3002<\/p>\n<p><!--more--><\/p>\n<p>\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u6aa2\u67e5\u50b3\u5165\u7684\u53c3\u6578\u662f\u5426\u7b26\u5408\u6307\u5b9a\u7684\u985e\u578b\uff0c\u5982\u679c\u4e0d\u7b26\u5408\uff0c\u5247\u6703\u62cb\u51fa\u4e00\u500b\u932f\u8aa4\u3002\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u53ef\u4ee5\u6aa2\u67e5\u50b3\u5165\u7684\u53c3\u6578\u662f\u5426\u7b26\u5408\u6307\u5b9a\u7684\u985e\u578b\uff0c\u5982\u679c\u4e0d\u7b26\u5408\uff0c\u5247\u6703\u62cb\u51fa\u4e00\u500b\u932f\u8aa4\u3002<\/p>\n<h2>\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u7684\u4f7f\u7528<\/h2>\n<p>\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u53ef\u4ee5\u5728\u7de8\u8b6f\u6642\u671f\u6aa2\u67e5\u51fa\u932f\u8aa4\uff0c\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u51fa\u932f\u7684\u6a5f\u6703\u3002\u4e0b\u9762\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre class=\"brush: javascript\">\nfunction isString(value: any): value is string {\n  return typeof value === 'string';\n}\n\nfunction printString(value: any) {\n  if (isString(value)) {\n    console.log(value);\n  } else {\n    console.error('value is not a string');\n  }\n}\n\nprintString('Hello World'); \/\/ Hello World\nprintString(123); \/\/ value is not a string\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba isString \u7684\u51fd\u6578\uff0c\u5b83\u63a5\u53d7\u4e00\u500b\u53c3\u6578\uff0c\u4e26\u6aa2\u67e5\u50b3\u5165\u7684\u53c3\u6578\u662f\u5426\u70ba\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u5982\u679c\u662f\uff0c\u5247\u8fd4\u56de true\uff0c\u5426\u5247\u8fd4\u56de false\u3002<\/p>\n<p>\u7136\u5f8c\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba printString \u7684\u51fd\u6578\uff0c\u5b83\u63a5\u53d7\u4e00\u500b\u53c3\u6578\uff0c\u4e26\u8abf\u7528 isString \u51fd\u6578\u4f86\u6aa2\u67e5\u50b3\u5165\u7684\u53c3\u6578\u662f\u5426\u70ba\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u5982\u679c\u662f\uff0c\u5247\u5c07\u53c3\u6578\u8f38\u51fa\u5230\u63a7\u5236\u53f0\uff0c\u5426\u5247\u5c07\u932f\u8aa4\u4fe1\u606f\u8f38\u51fa\u5230\u63a7\u5236\u53f0\u3002<\/p>\n<h2>\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u7684\u512a\u9ede<\/h2>\n<p>\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u53ef\u4ee5\u5728\u7de8\u8b6f\u6642\u671f\u6aa2\u67e5\u51fa\u932f\u8aa4\uff0c\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u51fa\u932f\u7684\u6a5f\u6703\uff0c\u4e26\u4e14\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u7c7b\u578b\u4fdd\u62a4\u51fd\u6578\u53ef\u4ee5\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u7684\u91cd\u8907\uff0c\u56e0\u70ba\u53ef\u4ee5\u5c07\u6aa2\u67e5\u985e\u578b\u7684\u7a0b\u5f0f\u78bc\u62bd\u53d6\u51fa\u4f86\uff0c\u653e\u5230\u4e00\u500b\u51fd\u6578\u4e2d\uff0c\u7136\u5f8c\u5728\u9700\u8981\u7684\u5730\u65b9\u8abf\u7528\u8a72\u51fd\u6578\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u7684\u91cd\u8907\uff0c\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>TypeScript \u63d0\u4f9b\u4e86\u4e00\u7a2e\u53eb\u505a\u300c\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570(type protection function)\u300d\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u5728\u7de8\u8b6f\u6642\u671f\u6aa2\u67e5\u51fa\u932f\u8aa4\uff0c\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u51fa\u932f\u7684\u6a5f\u6703\u3002\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u53ef\u4ee5\u6aa2\u67e5\u50b3\u5165\u7684\u53c3\u6578\u662f\u5426\u7b26\u5408\u6307\u5b9a\u7684\u985e\u578b\uff0c\u5982\u679c\u4e0d\u7b26\u5408\uff0c\u5247\u6703\u62cb\u51fa\u4e00\u500b\u932f\u8aa4\u3002\u7c7b\u578b\u4fdd\u62a4\u51fd\u6578\u53ef\u4ee5\u6e1b\u5c11\u7a0b\u5f0f\u78bc\u7684\u91cd\u8907\uff0c\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6458\u8981\uff1aTypeScript\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u4eba\u54e1\u66f4\u597d\u5730\u4fdd\u8b77\u4ed6\u5011\u7684\u4ee3\u78bc\uff0c\u4e26\u78ba\u4fdd\u5b83\u5011\u7684\u4ee3\u78bc\u904b\u884c\u6b63\u5e38\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528TypeScript\u7c7b\u578b\u4fdd\u62a4\u51fd\u6570\uff0c\u4ee5\u53ca\u5b83\u5011\u5982\u4f55\u5e6b\u52a9\u958b\u767c\u4eba\u54e1\u4fdd\u8b77\u4ed6\u5011\u7684\u4ee3\u78bc\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-4850","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\/pcFK27-1ge","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4850","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=4850"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4850\/revisions"}],"predecessor-version":[{"id":4851,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4850\/revisions\/4851"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}