{"id":533,"date":"2024-11-16T16:32:15","date_gmt":"2024-11-16T08:32:15","guid":{"rendered":"https:\/\/womeifei.cn\/?p=533"},"modified":"2024-11-16T16:32:15","modified_gmt":"2024-11-16T08:32:15","slug":"js%e8%bf%9b%e9%98%b6-array%e9%81%8d%e5%8e%86%e6%b7%b1%e7%a9%b6","status":"publish","type":"post","link":"https:\/\/womeifei.cn\/index.php\/2024\/11\/16\/js%e8%bf%9b%e9%98%b6-array%e9%81%8d%e5%8e%86%e6%b7%b1%e7%a9%b6\/","title":{"rendered":"JS\u8fdb\u9636-Array\u904d\u5386\u6df1\u7a76"},"content":{"rendered":"\n<p class=\"has-large-font-size wp-block-paragraph\">\u4e00.map(\u4e00 \u4e00 \u6620 \u5c04)  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">map()\u662f\u6570\u7ec4\u7684\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570\u65b9\u6cd5 \u7528\u4e8e<strong>\u5bf9\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u6307\u5b9a\u7684\u51fd\u6570<\/strong> <strong>\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4<\/strong>(\u4e0d\u4f1a\u4fee\u6539\u539f\u59cb\u6570\u7ec4 \u65b0\u6570\u7ec4\u5143\u7d20\u662f\u56de\u8c03\u51fd\u6570\u7684\u8fd4\u56de\u503c)  \u5b83\u53ef\u4ee5\u63a5\u6536\u4e00\u4e2a\u56de\u8c03\u51fd\u6570 \u51fd\u6570\u4e2d(ele,index)\u5206\u522b\u4e3a\u6570\u7ec4\u5143\u7d20\u548c\u6570\u7ec4\u4e0b\u6807 <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-108-1024x655.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"655\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-108-1024x655.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-536\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Example: <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const arr = &#91;'red', 'blue' , 'green']\nconst newArr = arr.map(function (ele, index) {\n\tconsole.log(ele) \/\/ \u6570\u7ec4\u5143\u7d20\n\tconsole.log(index) \/\/ \u6570\u7ec4\u7d22\u5f15\u53f7\n\treturn ele + '\u989c\u8272'\n})\nconsole.log(newArr)\t\n\/\/newArr: &#91;'red\u989c\u8272\u2019\uff0cblue\u989c\u8272\u2019\uff0cgreen\u989c\u8272']<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\u4e8c.forEach\u904d\u5386<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">forEach()\u662f\u6570\u7ec4\u7684\u4e00\u4e2a\u51fd\u6570\u65b9\u6cd5 \u4f1a\u81ea\u52a8\u8fed\u4ee3\u6570\u7ec4 <strong>\u5bf9\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u6307\u5b9a\u7684\u56de\u8c03\u51fd\u6570 \u6ca1\u6709\u8fd4\u56de\u503c<\/strong>  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u8bed\u6cd5\u4e3a arr.forEach((ele,index)= >{) ele\u4e3a\u6570\u7ec4\u5143\u7d20 index\u4e3a\u6570\u7ec4\u4e0b\u6807 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6ce8\u610f\u70b9:\u539f\u6570\u7ec4\u4fdd\u6301\u4e0d\u53d8<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-107-1024x388.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"388\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-107-1024x388.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-534\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\u4e09.filter\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">filter()\u662f\u6570\u7ec4\u7684\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570\u65b9\u6cd5 <strong>\u7528\u4e8e\u7b5b\u9009\u6570\u7ec4\u4e2d\u6ee1\u8db3\u6307\u5b9a\u6761\u4ef6\u7684\u5143\u7d20\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4 \u4e0d\u4f1a\u4fee\u6539\u539f\u59cb\u6570\u7ec4 \u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4 \u65b0\u6570\u7ec4\u4e2d\u5305\u542b\u6ee1\u8db3\u7b5b\u9009\u6761\u4ef6\u7684\u5143\u7d20<\/strong> <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u8bed\u6cd5\u548c\u524d\u9762\u4e24\u4e2a\u7c7b\u4f3c \u4e0d\u8d58\u8ff0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var numbers = &#91;1, 2, 3, 4, 5, 6, 7, 8, 9, 10];\nvar filteredNumbers = numbers.filter(function(num) {\n  return num >= 5;\n});\nconsole.log(filteredNumbers); \/\/ &#91;5, 6, 7, 8, 9, 10]<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\u56db.reduce\u9ad8\u9636\u51fd\u6570(\u8fed\u4ee3(\u7d2f\u52a0\u5668))<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">reduce()\u662f\u6570\u7ec4\u7684\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570\u65b9\u6cd5 <strong>\u7528\u4e8e\u5bf9\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u7d2f\u8ba1\u64cd\u4f5c \u5c06\u6570\u7ec4\u7f29\u51cf\u4e3a\u4e00\u4e2a\u503c <\/strong>\u4ed6\u901a\u8fc7\u63d0\u4f9b\u7684\u56de\u8c03\u51fd\u6570\u6765\u5b9e\u73b0\u7d2f\u8ba1\u64cd\u4f5c \u5e76\u8fd4\u56de\u6700\u7ec8\u7ed3\u679c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bed\u6cd5\u5982\u4e0b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">array.reduce(callback, initialValue) <strong>\u5176\u4e2dcallback\u662f\u4e00\u4e2a\u56de\u8c03\u51fd\u6570 initvalue\u662f\u53ef\u9009\u7684\u521d\u59cb\u503c <\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var numbers = &#91;1, 2, 3, 4, 5];\n \nvar sum = numbers.reduce(function (accumulator, currentValue) {\n  return accumulator + currentValue;\n}, 0); \n \nconsole.log(sum); \/\/ \u8f93\u51fa\uff1a15<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-109.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"841\" height=\"657\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-109.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-537\"  sizes=\"auto, (max-width: 841px) 100vw, 841px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u7528reduce()\u65b9\u6cd5\u6c42\u548c\/\u6c42\u6700\u503c\/\u6570\u7ec4\u53bb\u91cd(\u6709\u70b9\u610f\u601d) \u4e0b\u9762\u662f\u5b9e\u73b0\u6570\u7ec4\u53bb\u91cd\u7684\u4ee3\u7801 (\u521d\u59cb\u5316\u503c\u4e3a\u7a7a\u6570\u7ec4)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var numbers = &#91;1, 2, 3, 3, 4, 4, 5];\nvar uniqueNumbers = numbers.reduce((accumulator, currentValue) => {\n  if (accumulator.indexOf(currentValue) === -1) {\n    accumulator.push(currentValue);\n  }\n  return accumulator;\n}, &#91;]);\nconsole.log(uniqueNumbers); \/\/ \u8f93\u51fa\uff1a&#91;1, 2, 3, 4, 5]<\/code><\/pre>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\u4e94.some()\/every()<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u6240\u6709\u5143\u7d20\u904d\u5386 \u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c \u539f\u6570\u7ec4\u4e0d\u53d8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">every()\u8981\u6c42\u6240\u6709\u5143\u7d20\u90fd\u6ee1\u8db3\u6761\u4ef6 some()\u53ea\u8981\u6c42\u5b58\u5728\u5143\u7d20\u6ee1\u8db3\u6761\u4ef6<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-110-1024x292.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"292\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-110-1024x292.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-538\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-111-1024x391.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"391\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-111-1024x391.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-539\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\u516d.find()\u904d\u5386<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u8c03\u7528\u4e00\u6b21\u51fd\u6570\u6267\u884c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5728\u6d4b\u8bd5\u6761\u4ef6\u65f6\u8fd4\u56detrue\uff0c<strong>find()\u8fd4\u56de\u7b26\u5408\u6761\u4ef6\u7684\u5143\u7d20\uff0c\u4e4b\u540e\u7684\u503c\u4e0d\u4f1a\u518d\u6267\u884c\u51fd\u6570<\/strong>\uff1b\u5982\u679c\u6ca1\u6709\u7b26\u5408\u6761\u4ef6\u7684\u5143\u7d20\u5219\u8fd4\u56deundefined\uff0c\u539f\u6570\u7ec4\u4e0d\u53d8 <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-112-1024x446.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"446\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-112-1024x446.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-540\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00.map(\u4e00 \u4e00 \u6620 \u5c04) map()\u662f\u6570\u7ec4\u7684\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570\u65b9\u6cd5 \u7528\u4e8e\u5bf9\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u6307\u5b9a\u7684\u51fd\u6570 \u5e76\u8fd4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,1],"tags":[],"class_list":["post-533","post","type-post","status-publish","format-standard","hentry","category-javascript","category-1"],"_links":{"self":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/comments?post=533"}],"version-history":[{"count":1,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/533\/revisions"}],"predecessor-version":[{"id":541,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/533\/revisions\/541"}],"wp:attachment":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/media?parent=533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/categories?post=533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/tags?post=533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}