{"id":198925,"date":"2020-08-31T09:25:27","date_gmt":"2020-08-31T01:25:27","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=198925"},"modified":"2020-08-23T17:26:18","modified_gmt":"2020-08-23T09:26:18","slug":"javascript-array-function","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/javascript-array-function.html","title":{"rendered":"\u6084\u6084\u544a\u8bc9\u4f6013 \u4e2a JavaScript \u6570\u7ec4\u7cbe\u7b80\u6280\u5de7"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 20px;\"><strong>\u6570\u7ec4\u662f JS \u6700\u5e38\u89c1\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u54b1\u4eec\u5728\u5f00\u53d1\u4e2d\u4e5f\u7ecf\u5e38\u7528\u5230,\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d,\u63d0\u4f9b\u4e00\u4e9b\u5c0f\u6280\u5de7,\u5e2e\u52a9\u54b1\u4eec\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3002<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>1. \u5220\u9664\u6570\u7ec4\u7684\u91cd\u590d\u9879<\/strong><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/1-14.png\" alt=\"\" width=\"550\" height=\"216\" class=\"alignnone size-full wp-image-198926\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/1-14.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/1-14-300x118.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>2. \u66ff\u6362\u6570\u7ec4\u4e2d\u7684\u7279\u5b9a\u503c<\/strong><\/div>\n<p>\u6709\u65f6\u5728\u521b\u5efa\u4ee3\u7801\u65f6\u9700\u8981\u66ff\u6362\u6570\u7ec4\u4e2d\u7684\u7279\u5b9a\u503c\uff0c\u6709\u4e00\u79cd\u5f88\u597d\u7684\u7b80\u77ed\u65b9\u6cd5\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u54b1\u4eec\u53ef\u4ee5\u4f7f\u7528 .splice(start\u3001value to remove\u3001valueToAdd) \uff0c\u8fd9\u4e9b\u53c2\u6570\u6307\u5b9a\u54b1\u4eec\u5e0c\u671b\u4ece\u54ea\u91cc\u5f00\u59cb\u4fee\u6539\u3001\u4fee\u6539\u591a\u5c11\u4e2a\u503c\u548c\u66ff\u6362\u65b0\u503c\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/2-15.png\" alt=\"\" width=\"550\" height=\"179\" class=\"alignnone size-full wp-image-198929\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/2-15.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/2-15-300x98.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>3. Array.from \u8fbe\u5230 .map \u7684\u6548\u679c<\/strong><\/div>\n<p>\u54b1\u4eec\u90fd\u77e5\u9053 .map() \u65b9\u6cd5\uff0c .from() \u65b9\u6cd5\u4e5f\u53ef\u4ee5\u7528\u6765\u83b7\u5f97\u7c7b\u4f3c\u7684\u6548\u679c\u4e14\u4ee3\u7801\u4e5f\u5f88\u7b80\u6d01\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/3-15.png\" alt=\"\" width=\"550\" height=\"295\" class=\"alignnone size-full wp-image-198930\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/3-15.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/3-15-300x161.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>4.\u7f6e\u7a7a\u6570\u7ec4<\/strong><\/div>\n<p>\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u6e05\u7a7a\u6570\u7ec4\uff0c\u4e00\u4e2a\u5feb\u6377\u7684\u65b9\u6cd5\u5c31\u662f\u76f4\u63a5\u8ba9\u6570\u7ec4\u7684 length \u5c5e\u6027\u4e3a 0 \uff0c\u5c31\u53ef\u4ee5\u6e05\u7a7a\u6570\u7ec4\u4e86\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/4-12.png\" alt=\"\" width=\"550\" height=\"610\" class=\"alignnone size-full wp-image-198933\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/4-12.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/4-12-270x300.png 270w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>5. \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5bf9\u8c61<\/strong><\/div>\n<p>\u6709\u65f6\u5019\uff0c\u51fa\u4e8e\u67d0\u79cd\u76ee\u7684\uff0c\u9700\u8981\u5c06\u6570\u7ec4\u8f6c\u5316\u6210\u5bf9\u8c61\uff0c\u4e00\u4e2a\u7b80\u5355\u5feb\u901f\u7684\u65b9\u6cd5\u662f\u5c31\u4f7f\u7528\u5c55\u5f00\u8fd0\u7b97\u7b26\u53f7( ... ):<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/5-6.png\" alt=\"\" width=\"550\" height=\"223\" class=\"alignnone size-full wp-image-198934\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/5-6.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/5-6-300x122.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>6. \u7528\u6570\u636e\u586b\u5145\u6570\u7ec4<\/strong><\/div>\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5f53\u54b1\u4eec\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\u5e76\u5e0c\u671b\u7528\u4e00\u4e9b\u6570\u636e\u6765\u586b\u5145\u5b83\uff0c\u8fd9\u65f6 .fill() \u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u54b1\u4eec\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/6-3.png\" alt=\"\" width=\"550\" height=\"155\" class=\"alignnone size-full wp-image-198937\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/6-3.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/6-3-300x85.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>7. \u6570\u7ec4\u5408\u5e76<\/strong><\/div>\n<p>\u4f7f\u7528\u5c55\u5f00\u64cd\u4f5c\u7b26\uff0c\u4e5f\u53ef\u4ee5\u5c06\u591a\u4e2a\u6570\u7ec4\u5408\u5e76\u8d77\u6765\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/7-2.png\" alt=\"\" width=\"550\" height=\"177\" class=\"alignnone size-full wp-image-198938\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/7-2.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/7-2-300x97.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>8.\u6c42\u4e24\u4e2a\u6570\u7ec4\u7684\u4ea4\u96c6<\/strong><\/div>\n<p>\u6c42\u4e24\u4e2a\u6570\u7ec4\u7684\u4ea4\u96c6\u5728\u9762\u8bd5\u4e2d\u4e5f\u662f\u6709\u4e00\u5b9a\u96be\u5ea6\u7684\u6b63\u70b9\uff0c\u4e3a\u4e86\u627e\u5230\u4e24\u4e2a\u6570\u7ec4\u7684\u4ea4\u96c6\uff0c\u9996\u5148\u4f7f\u7528\u4e0a\u9762\u7684\u65b9\u6cd5\u786e\u4fdd\u6240\u68c0\u67e5\u6570\u7ec4\u4e2d\u7684\u503c\u4e0d\u91cd\u590d\uff0c\u63a5\u7740\u4f7f\u7528filter \u65b9\u6cd5\u548c .includes \u65b9\u6cd5\u3002\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/8-1.png\" alt=\"\" width=\"550\" height=\"183\" class=\"alignnone size-full wp-image-198942\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/8-1.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/8-1-300x100.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>9.\u4ece\u6570\u7ec4\u4e2d\u5220\u9664\u865a\u503c<\/strong><\/div>\n<p>\u5728 JS \u4e2d\uff0c\u865a\u503c\u6709 false , 0 \uff0c '' \uff0c null , NaN , undefined \u3002\u54b1\u4eec\u53ef\u4ee5 .filter() \u65b9\u6cd5\u6765\u8fc7\u6ee4\u8fd9\u4e9b\u865a\u503c\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/9-1.png\" alt=\"\" width=\"550\" height=\"205\" class=\"alignnone size-full wp-image-198943\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/9-1.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/9-1-300x112.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>10. \u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u968f\u673a\u503c<\/strong><\/div>\n<p>\u6709\u65f6\u6211\u4eec\u9700\u8981\u4ece\u6570\u7ec4\u4e2d\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u503c\u3002\u4e00\u79cd\u65b9\u4fbf\u7684\u65b9\u6cd5\u662f\u53ef\u4ee5\u6839\u636e\u6570\u7ec4\u957f\u5ea6\u83b7\u5f97\u4e00\u4e2a\u968f\u673a\u7d22\u5f15\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/10-1.png\" alt=\"\" width=\"550\" height=\"171\" class=\"alignnone size-full wp-image-198944\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/10-1.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/10-1-300x93.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>11.\u53cd\u8f6c\u6570\u7ec4<\/strong><\/div>\n<p>\u73b0\u5728\uff0c\u54b1\u4eec\u9700\u8981\u53cd\u8f6c\u6570\u7ec4\u65f6\uff0c\u6ca1\u6709\u5fc5\u8981\u901a\u8fc7\u590d\u6742\u7684\u5faa\u73af\u548c\u51fd\u6570\u6765\u521b\u5efa\u5b83\uff0c\u6570\u7ec4\u7684 reverse \u65b9\u6cd5\u5c31\u53ef\u4ee5\u505a\u4e86\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/11-1.png\" alt=\"\" width=\"550\" height=\"142\" class=\"alignnone size-full wp-image-198945\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/11-1.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/11-1-300x77.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>12 lastIndexOf() \u65b9\u6cd5<\/strong><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/12-1.png\" alt=\"\" width=\"550\" height=\"244\" class=\"alignnone size-full wp-image-198946\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/12-1.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/12-1-300x133.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>13.\u5bf9\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u503c\u6c42\u548c<\/strong><\/div>\n<p>JS \u9762\u8bd5\u4e2d\u4e5f\u7ecf\u5e38\u7528 reduce \u65b9\u6cd5\u6765\u5de7\u5999\u7684\u89e3\u51b3\u95ee\u9898<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/13-1.png\" alt=\"\" width=\"550\" height=\"287\" class=\"alignnone size-full wp-image-198947\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/13-1.png 550w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/08\/13-1-300x157.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u603b\u7ed3<\/strong><\/div>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u4ecb\u7ecd\u4e8613\u4e2a\u6280\u5de7\uff0c\u5e0c\u671b\u5b83\u4eec\u53ef\u4ee5\u5e2e\u52a9\u7f16\u5199\u7b80\u6d01\u4ee3\u7801\uff0c\u5982\u679c\u4f60\u8fd8\u6709\u66f4\u597d\u7684\u529e\u6cd5\uff0c\u6b22\u8fce\u7559\u8a00\u8ba8\u8bba\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u65f6\u5728\u521b\u5efa\u4ee3\u7801\u65f6\u9700\u8981\u66ff\u6362\u6570\u7ec4\u4e2d\u7684\u7279\u5b9a\u503c\uff0c\u6709\u4e00\u79cd\u5f88\u597d\u7684\u7b80\u77ed\u65b9\u6cd5\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u54b1\u4eec\u53ef\u4ee5\u4f7f\u7528 .splice(st [&hellip;]<\/p>\n","protected":false},"author":1920,"featured_media":197632,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-198925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/198925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/1920"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=198925"}],"version-history":[{"count":3,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/198925\/revisions"}],"predecessor-version":[{"id":199076,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/198925\/revisions\/199076"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/197632"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=198925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=198925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=198925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}