{"id":12458,"date":"2023-11-28T22:54:22","date_gmt":"2023-11-28T14:54:22","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12458"},"modified":"2023-11-28T22:54:26","modified_gmt":"2023-11-28T14:54:26","slug":"qian-duan-mian-shi-ti-shou-dong-shi-xianarray-prot","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/qian-duan-mian-shi-ti-shou-dong-shi-xianarray-prot\/","title":{"rendered":"\u524d\u7aef\u9762\u8bd5\u9898\uff1a\u624b\u52a8\u5b9e\u73b0Array. prototype. reduce\u65b9\u6cd5\uff1f"},"content":{"rendered":"<p>reduce()\u65b9\u6cd5\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u7531\u60a8\u63d0\u4f9b\u7684reducer\u51fd\u6570(\u5347\u5e8f\u6267\u884c)\uff0c\u5c06\u5176\u7ed3\u679c \u6c47\u603b\u4e3a\u5355\u4e2a\u8fd4\u56de\u503c\u3002<br \/>\nfunction reduce(arr, reduceCallback, initialValue) {<br \/>\n\/\/\u9996\u5148\uff0c\u68c0\u67e5\u4f20\u9012\u7684\u53c2\u6570\u662f\u5426\u6b63\u786e\u3002<br \/>\nif (!Array. isArray(arr) | | !arr. length | | typeof reduceCallback !== &#8216;function&#8217;)<br \/>\n{<br \/>\nreturn [];<br \/>\n} else {<br \/>\n\/\/\u5982\u679c\u6ca1\u6709\u5c06initialValue\u4f20\u9012\u7ed9\u8be5\u51fd\u6570\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u7b2c\u4e00\u4e2a\u6570\u7ec4\u9879\u4f5c\u4e3ainitialValue<br \/>\nlet hasInitialValue = initialValue !== undefined\uff1b<br \/>\nlet value = hasInitialValue ? initialValue : arr[0]\uff1b<br \/>\n\/\/\u5982\u679c\u6709\u4f20\u9012initialvalue,\u5219\u7d22\u5f15\u4ece1\u5f00\u59cb\uff0c\u5426\u5219\u4ece0\u5f00\u59cb<br \/>\nfor (let i = hasInitialValue ? 0 \uff1a 1, len = arr. length\uff1b i &lt; len\uff1b i++) {<br \/>\nvalue = reduceCallback(value, arr[i], i, arr)\uff1b<br \/>\n}<br \/>\nreturn value\uff1b<br \/>\n}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>reduce()\u65b9\u6cd5\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u7531\u60a8\u63d0\u4f9b\u7684reducer\u51fd\u6570(\u5347\u5e8f\u6267\u884c)\uff0c\u5c06\u5176\u7ed3\u679c \u6c47\u603b\u4e3a\u5355\u4e2a\u8fd4 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-12458","post","type-post","status-publish","format-standard","hentry","category-qianduan"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12458","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\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12458"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12458\/revisions"}],"predecessor-version":[{"id":12459,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12458\/revisions\/12459"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12458"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}