{"id":245,"date":"2020-06-19T20:07:00","date_gmt":"2020-06-19T12:07:00","guid":{"rendered":"http:\/\/robot.tanxiaodian.com\/?p=245"},"modified":"2020-06-19T20:07:00","modified_gmt":"2020-06-19T12:07:00","slug":"js-%e4%b8%ad%e5%88%a4%e6%96%ad%e7%a9%ba%e5%80%bc-undefined-%e5%92%8c-null","status":"publish","type":"post","link":"https:\/\/log.tanxiaodian.com\/?p=245","title":{"rendered":"JS \u4e2d\u5224\u65ad\u7a7a\u503c undefined \u548c null"},"content":{"rendered":"<p>https:\/\/www.cnblogs.com\/thiaoqueen\/p\/6904398.html<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"\u4ee5\u4e0b\u662f\u6b63\u786e\u7684\u7528\u6cd5\"><strong>\u4ee5\u4e0b\u662f\u6b63\u786e\u7684\u7528\u6cd5\uff1a<\/strong><\/h2>\n<div class=\"cnblogs_code\">\n<pre>var exp = null; \r\nif (!exp &amp;&amp; typeof(exp)!=\u201dundefined\u201d &amp;&amp; exp!=0) \r\n{ \r\nalert(\u201cis null\u201d); \r\n}<\/pre>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/www.cnblogs.com\/t&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/log.tanxiaodian.com\/?p=245\">Continue reading<span class=\"screen-reader-text\">JS \u4e2d\u5224\u65ad\u7a7a\u503c undefined \u548c null<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/245"}],"collection":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=245"}],"version-history":[{"count":1,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/245\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/245\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}