{"id":5272,"date":"2023-01-05T12:21:16","date_gmt":"2023-01-05T04:21:16","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=5272"},"modified":"2023-01-05T12:21:16","modified_gmt":"2023-01-05T04:21:16","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8typescriptmap%e5%88%a4%e6%96%b7%e9%8d%b5%e5%90%8d%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8typescriptmap%e5%88%a4%e6%96%b7%e9%8d%b5%e5%90%8d%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8\/","title":{"rendered":"\u5982\u4f55\u5229\u7528TypeScriptMap\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"TypeScript, Map, has()\"><\/p>\n<h1>TypeScript Map \u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728(has())<\/h1>\n<p>TypeScript Map \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u5b83\u53ef\u4ee5\u8b93\u6211\u5011\u5feb\u901f\u5730\u67e5\u627e\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u800c\u4e0d\u9700\u8981\u904d\u6b77\u6574\u500bMap\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528TypeScript Map\u7684has()\u65b9\u6cd5\u4f86\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662fTypeScript Map\uff1f<\/h2>\n<p>TypeScript Map\u662f\u4e00\u7a2e\u8cc7\u6599\u7d50\u69cb\uff0c\u5b83\u53ef\u4ee5\u5c07\u9375\u548c\u503c\u5c0d\u61c9\u8d77\u4f86\uff0c\u4e26\u4e14\u53ef\u4ee5\u5feb\u901f\u5730\u67e5\u627e\u9375\u540d\u662f\u5426\u5b58\u5728\u3002\u5b83\u7684\u512a\u9ede\u5728\u65bc\u53ef\u4ee5\u5feb\u901f\u5730\u67e5\u627e\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u800c\u4e0d\u9700\u8981\u904d\u6b77\u6574\u500bMap\u3002<\/p>\n<h2>\u5982\u4f55\u4f7f\u7528TypeScript Map\u7684has()\u65b9\u6cd5\uff1f<\/h2>\n<p>TypeScript Map\u7684has()\u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u5b83\u63a5\u53d7\u4e00\u500b\u53c3\u6578\uff0c\u5373\u8981\u67e5\u627e\u7684\u9375\u540d\uff0c\u4e26\u8fd4\u56de\u4e00\u500b\u5e03\u6797\u503c\uff0c\u8868\u793a\u8a72\u9375\u540d\u662f\u5426\u5b58\u5728\u3002<\/p>\n<pre class=\"brush: typescript\">\nlet myMap = new Map();\n\n\/\/ \u5c07\u9375\u548c\u503c\u5c0d\u61c9\u8d77\u4f86\nmyMap.set('name', 'John');\nmyMap.set('age', 20);\n\n\/\/ \u4f7f\u7528has()\u65b9\u6cd5\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728\nconsole.log(myMap.has('name')); \/\/ true\nconsole.log(myMap.has('gender')); \/\/ false\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u4f7f\u7528TypeScript Map\u7684has()\u65b9\u6cd5\u4f86\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u9375\u540d\u5b58\u5728\uff0c\u5247\u8fd4\u56detrue\uff0c\u5426\u5247\u8fd4\u56defalse\u3002<\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u4ecb\u7d39\u4e86TypeScript Map\u7684has()\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u7528\u4f86\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u4e26\u8fd4\u56de\u4e00\u500b\u5e03\u6797\u503c\uff0c\u8868\u793a\u8a72\u9375\u540d\u662f\u5426\u5b58\u5728\u3002TypeScript Map\u7684has()\u65b9\u6cd5\u53ef\u4ee5\u8b93\u6211\u5011\u5feb\u901f\u5730\u67e5\u627e\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u800c\u4e0d\u9700\u8981\u904d\u6b77\u6574\u500bMap\u3002<\/p>\n<p><!--more--><\/p>\n<h2>\u66f4\u591a\u8cc7\u6e90<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/advanced-types.html\" target=\"_blank\" rel=\"noopener\">TypeScript \u624b\u518a &#8211; \u9032\u968e\u578b\u5225<\/a><\/li>\n<li><a href=\"https:\/\/developer.mozilla.org\/zh-TW\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Map\" target=\"_blank\" rel=\"noopener\">MDN &#8211; Map<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528TypeScriptMap\u7684has()\u65b9\u6cd5\u4f86\u5224\u65b7\u9375\u540d\u662f\u5426\u5b58\u5728\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u7c21\u55ae\u7684\u7bc4\u4f8b\u4f86\u8a73\u7d30\u8aaa\u660e\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-5272","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\/pcFK27-1n2","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5272","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=5272"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5272\/revisions"}],"predecessor-version":[{"id":5273,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5272\/revisions\/5273"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=5272"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=5272"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=5272"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}