{"id":983,"date":"2017-05-18T10:44:11","date_gmt":"2017-05-18T02:44:11","guid":{"rendered":"http:\/\/feizhaojun.com\/?p=983"},"modified":"2017-05-18T10:45:47","modified_gmt":"2017-05-18T02:45:47","slug":"javascript-%e5%87%a0%e4%b8%aa%e9%9c%80%e8%a6%81%e6%b3%a8%e6%84%8f%e7%9a%84%e7%9f%a5%e8%af%86%e7%82%b9","status":"publish","type":"post","link":"https:\/\/feizhaojun.com\/?p=983","title":{"rendered":"JavaScript \u51e0\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u77e5\u8bc6\u70b9"},"content":{"rendered":"

1 for in
\nfor in \u5faa\u73af\u53ef\u4ee5\u53d6\u5f97\u5bf9\u8c61\u6240\u6709\u53ef\u679a\u4e3e\u7684\u5c5e\u6027\uff0c\u5305\u62ec\u7ee7\u627f\u7684\u5c5e\u6027\u3002
\nObject.keys() \u4e0d\u80fd\u53d6\u5f97\u7ee7\u627f\u7684\u5c5e\u6027\uff0c\u800c Object.getOwnPropertyNames() \u53ef\u4ee5\u66ff\u4ee3 for in\u3002<\/p>\n

2 \u4f7f\u7528 new \u64cd\u4f5c\u7b26\u521b\u5efa\u5bf9\u8c61\uff0c\u5982\u679c\u6784\u9020\u51fd\u6570\u5185\u90e8\u6709 return \u8bed\u53e5\uff0c\u800c\u4e14 return \u540e\u9762\u8ddf\u7740\u4e00\u4e2a\u590d\u6742\u6570\u636e\u7c7b\u578b\uff08\u5bf9\u8c61\uff0c\u6570\u7ec4\u7b49\uff09\uff0cnew \u547d\u4ee4\u4f1a\u8fd4\u56de return \u8bed\u53e5\u6307\u5b9a\u7684\u5bf9\u8c61\uff1b\u5982\u679c return \u8bed\u53e5\u540e\u9762\u8ddf\u7740\u4e00\u4e2a\u7b80\u5355\u6570\u636e\u7c7b\u578b\uff08\u5b57\u7b26\u4e32\uff0c\u5e03\u5c14\u503c\uff0c\u6570\u5b57\u7b49\uff09\uff0c\u5219\u4f1a\u5ffd\u7565 return \u8bed\u53e5\uff0c\u8fd4\u56de this \u5bf9\u8c61\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

1 for in for in \u5faa\u73af\u53ef\u4ee5\u53d6\u5f97\u5bf9\u8c61\u6240\u6709\u53ef\u679a\u4e3e\u7684\u5c5e\u6027\uff0c\u5305\u62ec\u7ee7\u627f\u7684\u5c5e\u6027\u3002 Object.keys() \u4e0d\u80fd\u53d6\u5f97…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,5],"tags":[],"class_list":["post-983","post","type-post","status-publish","format-standard","hentry","category-fe","category-javascript"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=983"}],"version-history":[{"count":3,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/983\/revisions"}],"predecessor-version":[{"id":986,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/983\/revisions\/986"}],"wp:attachment":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}