{"id":5478,"date":"2023-01-05T12:44:28","date_gmt":"2023-01-05T04:44:28","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=5478"},"modified":"2023-01-05T12:44:28","modified_gmt":"2023-01-05T04:44:28","slug":"%e4%ba%86%e8%a7%a3typescriptmap%e7%9a%84%e5%a4%a7%e5%b0%8fsize","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e4%ba%86%e8%a7%a3typescriptmap%e7%9a%84%e5%a4%a7%e5%b0%8fsize\/","title":{"rendered":"\u4e86\u89e3TypeScriptMap\u7684\u5927\u5c0f(size)"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"TypeScript, Map, \u8fd4\u56de, Map \u5bf9\u8c61, \u5927\u5c0f, size\"><\/p>\n<h1>TypeScript Map \u8fd4\u56de Map \u5bf9\u8c61\u7684\u5927\u5c0f(size)<\/h1>\n<p>TypeScript Map \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u8b93\u6211\u5011\u5c0d\u8cc7\u6599\u9032\u884c\u66f4\u6709\u6548\u7387\u7684\u7ba1\u7406\u3002\u5b83\u53ef\u4ee5\u8b93\u6211\u5011\u5feb\u901f\u5730\u67e5\u627e\u3001\u66f4\u65b0\u548c\u522a\u9664\u8cc7\u6599\uff0c\u800c\u4e14\u5b83\u4e5f\u53ef\u4ee5\u8b93\u6211\u5011\u8fd4\u56de Map \u5c0d\u8c61\u7684\u5927\u5c0f\uff08size\uff09\u3002<\/p>\n<p><!--more--><\/p>\n<p>\u5728 TypeScript \u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <span style=\"font-weight: bold;\">size<\/span> \u5c6c\u6027\u4f86\u8fd4\u56de Map \u5c0d\u8c61\u7684\u5927\u5c0f\uff0c\u5b83\u6703\u8fd4\u56de\u4e00\u500b\u6578\u5b57\uff0c\u4ee3\u8868 Map \u5c0d\u8c61\u4e2d\u7684\u9805\u76ee\u6578\u91cf\u3002<\/p>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b Map \u5c0d\u8c61\uff0c\u5b83\u5305\u542b\u4e86\u4e09\u500b\u9805\u76ee\uff1a<\/p>\n<pre class=\"brush: javascript\">\nlet myMap = new Map();\nmyMap.set('name', 'John');\nmyMap.set('age', 25);\nmyMap.set('location', 'New York');\n<\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <span style=\"font-weight: bold;\">size<\/span> \u5c6c\u6027\u4f86\u8fd4\u56de Map \u5c0d\u8c61\u7684\u5927\u5c0f\uff1a<\/p>\n<pre class=\"brush: javascript\">\nlet size = myMap.size;\nconsole.log(size); \/\/ 3\n<\/pre>\n<p>\u56e0\u6b64\uff0c\u6211\u5011\u53ef\u4ee5\u5f97\u77e5\u9019\u500b Map \u5c0d\u8c61\u4e2d\u6709\u4e09\u500b\u9805\u76ee\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528 <span style=\"font-weight: bold;\">size<\/span> \u5c6c\u6027\u4f86\u6aa2\u67e5 Map \u5c0d\u8c61\u662f\u5426\u70ba\u7a7a\uff1a<\/p>\n<pre class=\"brush: javascript\">\nlet myMap = new Map();\n\nif (myMap.size === 0) {\n  console.log('Map is empty');\n}\n<\/pre>\n<p>\u56e0\u6b64\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 TypeScript Map \u4e2d\u7684 <span style=\"font-weight: bold;\">size<\/span> \u5c6c\u6027\u4f86\u8fd4\u56de Map \u5c0d\u8c61\u7684\u5927\u5c0f\uff0c\u4ee5\u53ca\u6aa2\u67e5 Map \u5c0d\u8c61\u662f\u5426\u70ba\u7a7a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TypeScriptMap\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u6578\u64da\u7d50\u69cb\uff0c\u5b83\u53ef\u4ee5\u8b93\u60a8\u5c0d\u9375\u548c\u503c\u9032\u884c\u5feb\u901f\u67e5\u627e\uff0c\u4e26\u63d0\u4f9b\u4e86\u4e00\u500b\u7c21\u55ae\u7684\u65b9\u6cd5\u4f86\u7372\u53d6Map\u5c0d\u8c61\u7684\u5927\u5c0f\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528TypeScriptMap\u7684size()\u65b9\u6cd5\u4f86\u7372\u53d6Map\u5c0d\u8c61\u7684\u5927\u5c0f\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-5478","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\/pcFK27-1qm","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5478","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=5478"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5478\/revisions"}],"predecessor-version":[{"id":5479,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5478\/revisions\/5479"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=5478"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=5478"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=5478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}