{"id":4942,"date":"2023-01-05T11:23:32","date_gmt":"2023-01-05T03:23:32","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4942"},"modified":"2023-01-05T11:23:32","modified_gmt":"2023-01-05T03:23:32","slug":"%e6%b7%b1%e5%85%a5%e4%ba%86%e8%a7%a3typescript%e4%b8%ad%e7%9a%84%e7%b1%bb%e5%9e%8b%e6%96%ad%e8%a8%80%e3%80%81%e7%b1%bb%e5%9e%8b%e5%ae%88%e5%8d%ab%e5%92%8c%e7%b1%bb%e5%9e%8b%e5%88%ab%e5%90%8d","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e6%b7%b1%e5%85%a5%e4%ba%86%e8%a7%a3typescript%e4%b8%ad%e7%9a%84%e7%b1%bb%e5%9e%8b%e6%96%ad%e8%a8%80%e3%80%81%e7%b1%bb%e5%9e%8b%e5%ae%88%e5%8d%ab%e5%92%8c%e7%b1%bb%e5%9e%8b%e5%88%ab%e5%90%8d\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3TypeScript\u4e2d\u7684\u7c7b\u578b\u65ad\u8a00\u3001\u7c7b\u578b\u5b88\u536b\u548c\u7c7b\u578b\u522b\u540d"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"TypeScript, \u7c7b\u578b\u65ad\u8a00, \u7c7b\u578b\u5b88\u536b, \u7c7b\u578b\u522b\u540d\"><\/p>\n<p>TypeScript \u662f\u4e00\u7a2e JavaScript \u7684\u8d85\u96c6\uff0c\u5b83\u63d0\u4f9b\u4e86\u985e\u578b\u7cfb\u7d71\uff0c\u53ef\u4ee5\u5728\u7de8\u8b6f\u6642\u6aa2\u67e5\u932f\u8aa4\uff0c\u4ee5\u53ca\u66f4\u591a\u7684\u529f\u80fd\u3002TypeScript \u63d0\u4f9b\u4e86\u4e09\u7a2e\u4e0d\u540c\u7684\u985e\u578b\u7cfb\u7d71\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7ba1\u7406\u548c\u63a7\u5236\u4ed6\u5011\u7684\u4ee3\u78bc\uff1a\u7c7b\u578b\u65ad\u8a00\u3001\u7c7b\u578b\u5b88\u536b\u548c\u7c7b\u578b\u522b\u540d\u3002<\/p>\n<p><!--more--><\/p>\n<h2>TypeScript \u7c7b\u578b\u65ad\u8a00<\/h2>\n<p>TypeScript \u7c7b\u578b\u65ad\u8a00\u662f\u4e00\u79cd\u5f37\u5236\u5c07\u503c\u8f49\u63db\u70ba\u67d0\u7a2e\u985e\u578b\u7684\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u4e0d\u6539\u8b8a\u503c\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c07\u503c\u5f37\u5236\u8f49\u63db\u70ba\u67d0\u7a2e\u985e\u578b\u3002\u5b83\u53ef\u4ee5\u7528\u65bc\u6d88\u9664\u7de8\u8b6f\u5668\u7684\u8b66\u544a\uff0c\u6216\u8005\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u7528\u65bc\u6539\u5584\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u3002<\/p>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u6211\u5011\u60f3\u8981\u5c07\u5b83\u8f49\u63db\u70ba\u6578\u5b57\uff1a<\/p>\n<pre><code class=\"language-javascript line-numbers\">let myString = '123';\n<\/code><\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 TypeScript \u7c7b\u578b\u65ad\u8a00\u4f86\u5c07\u5b83\u8f49\u63db\u70ba\u6578\u5b57\uff1a<\/p>\n<pre><code class=\"language-javascript line-numbers\">let myNumber = &lt;number&gt;myString;\n<\/code><\/pre>\n<h2>TypeScript \u7c7b\u578b\u5b88\u536b<\/h2>\n<p>TypeScript \u7c7b\u578b\u5b88\u536b\u662f\u4e00\u7a2e\u6aa2\u67e5\u985e\u578b\u7684\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u6aa2\u67e5\u67d0\u500b\u503c\u662f\u5426\u70ba\u7279\u5b9a\u985e\u578b\u3002\u5b83\u53ef\u4ee5\u7528\u65bc\u6aa2\u67e5\u67d0\u500b\u503c\u662f\u5426\u70ba\u7279\u5b9a\u985e\u578b\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u65bc\u6aa2\u67e5\u67d0\u500b\u503c\u662f\u5426\u70ba\u7279\u5b9a\u503c\u3002<\/p>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u8b8a\u91cf\uff0c\u6211\u5011\u60f3\u8981\u6aa2\u67e5\u5b83\u662f\u5426\u70ba\u5b57\u7b26\u4e32\uff1a<\/p>\n<pre><code class=\"language-javascript line-numbers\">let myValue = '123';\n<\/code><\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 TypeScript \u7c7b\u578b\u5b88\u536b\u4f86\u6aa2\u67e5\u5b83\u662f\u5426\u70ba\u5b57\u7b26\u4e32\uff1a<\/p>\n<pre><code class=\"language-javascript line-numbers\">if (typeof myValue === 'string') {\n    \/\/ do something\n}\n<\/code><\/pre>\n<h2>TypeScript \u7c7b\u578b\u522b\u540d<\/h2>\n<p>TypeScript \u7c7b\u578b\u522b\u540d\u662f\u4e00\u7a2e\u5b9a\u7fa9\u65b0\u985e\u578b\u7684\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u5b9a\u7fa9\u4e00\u500b\u65b0\u7684\u985e\u578b\uff0c\u6216\u8005\u5c07\u591a\u500b\u985e\u578b\u7d44\u5408\u6210\u4e00\u500b\u65b0\u7684\u985e\u578b\u3002<\/p>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u8981\u5b9a\u7fa9\u4e00\u500b\u65b0\u7684\u985e\u578b\uff0c\u5b83\u662f\u4e00\u500b\u7531\u5b57\u7b26\u4e32\u548c\u6578\u5b57\u7d44\u6210\u7684\u985e\u578b\uff1a<\/p>\n<pre><code class=\"language-javascript line-numbers\">type MyType = string | number;\n<\/code><\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 TypeScript \u7c7b\u578b\u522b\u540d\u4f86\u5b9a\u7fa9\u4e00\u500b\u65b0\u7684\u985e\u578b\uff1a<\/p>\n<pre><code class=\"language-javascript line-numbers\">type MyType = string | number;\n<\/code><\/pre>\n<p>\u7e3d\u7d50\uff1aTypeScript \u7c7b\u578b\u65ad\u8a00\u3001\u7c7b\u578b\u5b88\u536b\u548c\u7c7b\u578b\u522b\u540d\u662f TypeScript 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