{"id":10318,"date":"2023-11-28T21:32:00","date_gmt":"2023-11-28T13:32:00","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10318"},"modified":"2023-11-30T18:53:21","modified_gmt":"2023-11-30T10:53:21","slug":"javascript-zhong-yun-suan-fu-neng-zuo-shen-me","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-yun-suan-fu-neng-zuo-shen-me\/","title":{"rendered":"JavaScript \u4e2d!!\u8fd0\u7b97\u7b26\u80fd\u505a\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p><code>!!<\/code> \u8fd0\u7b97\u7b26\u5728 JavaScript \u4e2d\u7528\u4e8e\u5c06\u4e00\u4e2a\u503c\u8f6c\u6362\u4e3a\u5176\u5bf9\u5e94\u7684\u5e03\u5c14\u503c\u3002\u5b83\u5b9e\u9645\u4e0a\u662f\u4e24\u4e2a\u903b\u8f91\u975e\uff08NOT\uff09\u8fd0\u7b97\u7b26 <code>!<\/code> \u7684\u7ec4\u5408\uff0c\u8fde\u7eed\u4f7f\u7528\u4e24\u6b21\u3002<\/p>\n<h3><a id=\"%E8%BF%90%E7%AE%97%E7%AC%A6%E7%9A%84%E4%BD%9C%E7%94%A8%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a><code>!!<\/code> \u8fd0\u7b97\u7b26\u7684\u4f5c\u7528\uff1a<\/h3>\n<ol>\n<li>\n<p><strong>\u5c06\u503c\u8f6c\u6362\u4e3a\u5e03\u5c14\u7c7b\u578b\uff1a<\/strong> \u65e0\u8bba\u4f20\u5165\u7684\u662f\u4ec0\u4e48\u7c7b\u578b\u7684\u503c\uff0c<code>!!<\/code> \u8fd0\u7b97\u7b26\u90fd\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684\u5e03\u5c14\u503c\uff0c\u5f3a\u5236\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5f3a\u5236\u8f6c\u6362\u4e3a\u5e03\u5c14\u7c7b\u578b\uff1a<\/strong> \u5c06\u975e\u5e03\u5c14\u7c7b\u578b\u7684\u503c\u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684\u5e03\u5c14\u503c\uff0c\u4f7f\u5176\u66f4\u6613\u4e8e\u8fdb\u884c\u903b\u8f91\u5224\u65ad\u6216\u5e03\u5c14\u8fd0\u7b97\u3002<\/p>\n<\/li>\n<\/ol>\n<h3><a id=\"%E7%A4%BA%E4%BE%8B%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u793a\u4f8b\uff1a<\/h3>\n<pre><code class=\"language-javascript\">console.log(!!0); \/\/ \u8f93\u51fa\uff1afalse\nconsole.log(!!1); \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(!!null); \/\/ \u8f93\u51fa\uff1afalse\nconsole.log(!!undefined); \/\/ \u8f93\u51fa\uff1afalse\nconsole.log(!!''); \/\/ \u8f93\u51fa\uff1afalse\nconsole.log(!!'hello'); \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(!!{}); \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(!![]); \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(!!NaN); \/\/ \u8f93\u51fa\uff1afalse\n<\/code><\/pre>\n<p><code>!!<\/code> \u8fd0\u7b97\u7b26\u53ef\u4ee5\u5feb\u901f\u5c06\u4efb\u4f55 JavaScript \u503c\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff0c\u901a\u8fc7\u4e24\u6b21\u903b\u8f91\u975e\u64cd\u4f5c\uff0c\u975e\u5e38\u5e38\u7528\u4e8e\u9700\u8981\u5bf9\u53d8\u91cf\u8fdb\u884c\u5e03\u5c14\u7c7b\u578b\u7684\u5224\u65ad\u6216\u8f6c\u6362\u7684\u60c5\u51b5\u4e0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>!! \u8fd0\u7b97\u7b26\u5728 JavaScript \u4e2d\u7528\u4e8e\u5c06\u4e00\u4e2a\u503c\u8f6c\u6362\u4e3a\u5176\u5bf9\u5e94\u7684\u5e03\u5c14\u503c\u3002\u5b83\u5b9e\u9645\u4e0a\u662f\u4e24\u4e2a\u903b\u8f91\u975e\uff08NOT\uff09\u8fd0\u7b97\u7b26 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-10318","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10318","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10318"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10318\/revisions"}],"predecessor-version":[{"id":13656,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10318\/revisions\/13656"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10318"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10318"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10318"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}