{"id":4785,"date":"2016-02-18T22:59:48","date_gmt":"2016-02-18T14:59:48","guid":{"rendered":"https:\/\/sdeno.com\/?p=4785"},"modified":"2018-05-27T22:03:00","modified_gmt":"2018-05-27T14:03:00","slug":"js%e7%b1%bb%e5%9e%8b%e6%a3%80%e6%b5%8b","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=4785","title":{"rendered":"js\u6570\u636e\u7c7b\u578b\u68c0\u6d4b"},"content":{"rendered":"<p>js\u7684\u7c7b\u578b\u68c0\u6d4b \u5224\u65ad \u5b57\u7b26\u4e32<br \/>\ntypeof \u548c instanceof \u533a\u522b<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e0d\u7ba1\u5bf9\u8c61\u3001\u6570\u7ec4\u8fd8\u662f\u6b63\u5219 \u7528typeof\u68c0\u6d4b\u90fd\u662f\u663e\u793a&#8217;Object&#8217;<br \/>\n\u4f7f\u7528instanceof\u53ef\u4ee5\u68c0\u6d4b\u51fa\u5177\u4f53\u7c7b\u578b\uff0c\u4f46\u662f\u53ea\u80fd\u7528\u4e8e\u53bb\u68c0\u6d4b\u90a3\u4e9b\u672c\u8eab\u5177\u6709\u4f20\u9012\u8d4b\u503c\u7684\u7c7b\u578b\u3002<br \/>\nvar box1=[];<br \/>\nvar box2={};<br \/>\nvar box3=\/g\/;<br \/>\nalert( box1 instanceof Array ) \/\/\u5982\u679c\u662f\u6570\u7ec4\u5c31\u8fd4\u56detrue<br \/>\nalert( box2 instanceof Object )<br \/>\nalert( box3 instanceof RegExp )<br \/>\nvar box4=&#8217;\u5b57\u7b26\u4e32&#8217;; \/\/\u5b57\u7b26\u4e32<br \/>\nvar box5=187; \/\/\u6570\u5b57<br \/>\n\u8001\u8001\u5b9e\u5b9e\u7684\u4f7f\u7528typeof\u53bb\u68c0\u6d4b<br \/>\nalert( typeof box4 ); \/\/String<br \/>\nalert( typeof box5 ); \/\/Number<\/p>\n<p>&nbsp;<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"PPcUGyicHu\"><p><a href=\"https:\/\/sdeno.com\/?p=6620\">JS\u4e2d\u5224\u65adnull\u3001undefined\u4e0eNaN\u7684\u65b9\u6cd5<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u300aJS\u4e2d\u5224\u65adnull\u3001undefined\u4e0eNaN\u7684\u65b9\u6cd5\u300b\u2014\u968f\u8eab\u7b14\u8bb0\" src=\"https:\/\/sdeno.com\/?p=6620&#038;embed=true#?secret=HTapc73pBp#?secret=PPcUGyicHu\" data-secret=\"PPcUGyicHu\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"LNEeVRnGb6\"><p><a href=\"https:\/\/sdeno.com\/?p=6673\">js \u904d\u5386\u3001\u679a\u4e3e<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u300ajs \u904d\u5386\u3001\u679a\u4e3e\u300b\u2014\u968f\u8eab\u7b14\u8bb0\" src=\"https:\/\/sdeno.com\/?p=6673&#038;embed=true#?secret=o5U27Qd8NK#?secret=LNEeVRnGb6\" data-secret=\"LNEeVRnGb6\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>js\u7684\u7c7b\u578b\u68c0\u6d4b \u5224\u65ad \u5b57\u7b26\u4e32 typeof \u548c instanceof \u533a\u522b &nbsp; \u4e0d\u7ba1\u5bf9\u8c61\u3001\u6570\u7ec4\u8fd8\u662f\u6b63 [&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-4785","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\/4785","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=4785"}],"version-history":[{"count":0,"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/4785\/revisions"}],"wp:attachment":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}