{"id":2662,"date":"2014-01-08T08:06:16","date_gmt":"2014-01-08T00:06:16","guid":{"rendered":"https:\/\/sdeno.com\/?p=2662"},"modified":"2014-01-03T11:13:45","modified_gmt":"2014-01-03T03:13:45","slug":"javascript-isnan%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=2662","title":{"rendered":"JavaScript isNaN()\u662f\u4ec0\u4e48"},"content":{"rendered":"<p>JavaScript\u4e2d\u7684isNaN()\u68c0\u67e5\u67d0\u4e2a\u503c\u662f\u4e0d\u662f\u6570\u5b57\uff0c\u5982\u679c\u4e0d\u662f\u6570\u5b57\u5c31\u6ee1\u8db3isNaN()\u8fd4\u56de\u7684\u662f\u771f\u3002<\/p>\n<p>isNaN()\u60f3\u8981\u83b7\u53d6\u7684\u662f\u90a3\u4e9b\u4e0d\u662f\u6570\u5b57\u7684\u503c\u3002<\/p>\n<p>[code]function myFunction()<br \/>\n{<br \/>\nvar x=document.getElementById(&#8220;demo&#8221;).value;<br \/>\nif(x==&#8221;&#8221;||isNaN(x))<br \/>\n{<br \/>\nalert(&#8220;Not Numeric&#8221;);<br \/>\n}<br \/>\n}[\/code]<\/p>\n<p>\u4f8b\u5b50\uff1a<\/p>\n<p>[code]&lt;script&gt;<\/p>\n<p>document.write(isNaN(123));<br \/>\ndocument.write(isNaN(-1.23));<br \/>\ndocument.write(isNaN(5-2));<br \/>\ndocument.write(isNaN(0));<br \/>\ndocument.write(isNaN(&#8220;Hello&#8221;));<br \/>\ndocument.write(isNaN(&#8220;2005\/12\/12&#8221;));<\/p>\n<p>&lt;\/script&gt;[\/code]<br \/>\n\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<p>[code]false<br \/>\nfalse<br \/>\nfalse<br \/>\nfalse<br \/>\ntrue<br \/>\ntrue[\/code]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u4e2d\u7684isNaN()\u68c0\u67e5\u67d0\u4e2a\u503c\u662f\u4e0d\u662f\u6570\u5b57\uff0c\u5982\u679c\u4e0d\u662f\u6570\u5b57\u5c31\u6ee1\u8db3isNaN()\u8fd4\u56de\u7684\u662f\u771f\u3002 is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,11],"tags":[],"class_list":["post-2662","post","type-post","status-publish","format-standard","hentry","category-javascript","category-11"],"_links":{"self":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/2662","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2662"}],"version-history":[{"count":0,"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/2662\/revisions"}],"wp:attachment":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}