{"id":266182,"date":"2024-05-15T16:38:04","date_gmt":"2024-05-15T08:38:04","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/266182.html"},"modified":"2024-05-15T16:38:10","modified_gmt":"2024-05-15T08:38:10","slug":"%e5%89%8d%e7%ab%af-javascript-%e4%bb%a3%e7%a0%81%e4%b8%ad%e5%ae%9a%e4%b9%89%e6%95%b0%e7%bb%84%e7%9a%84%e6%96%b9%e6%b3%95%e6%9c%89%e5%93%aa%e4%ba%9b-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/266182.html","title":{"rendered":"\u524d\u7aef javascript \u4ee3\u7801\u4e2d\u5b9a\u4e49\u6570\u7ec4\u7684\u65b9\u6cd5\u6709\u54ea\u4e9b"},"content":{"rendered":"

\"\u524d\u7aef<\/p>\n

\u5728JavaScript\u4e2d\uff0c\u5b9a\u4e49\u6570\u7ec4\u7684\u65b9\u6cd5\u4e3b\u8981\u5305\u62ec\u4e09\u79cd\uff1a\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u3001\u4f7f\u7528Array\u6784\u9020\u51fd\u6570<\/strong>\u4ee5\u53ca\u4f7f\u7528Array.of\u4e0eArray.from\u65b9\u6cd5<\/strong>\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5404\u5177\u7279\u8272\uff0c\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u662f\u6700\u5e38\u89c1\u4e14\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u7b80\u6d01\u76f4\u89c2\u3002<\/p>\n<\/p>\n

\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf<\/strong>\u662f\u6700\u76f4\u63a5\u7684\u5b9a\u4e49\u6570\u7ec4\u7684\u65b9\u6cd5\u3002\u5b83\u4e0d\u4ec5\u4ee3\u7801\u7b80\u6d01\u3001\u6613\u4e8e\u7406\u89e3\uff0c\u800c\u4e14\u5904\u7406\u901f\u5ea6\u5feb\u3002\u6570\u7ec4\u5b57\u9762\u91cf\u662f\u901a\u8fc7\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u7528\u9017\u53f7\u5206\u9694\uff0c\u6574\u4f53\u7528\u65b9\u62ec\u53f7[]\u5305\u56f4\u6765\u5b9a\u4e49\u7684\u3002\u4f8b\u5982\uff1alet fruits = ["apple", "banana", "cherry"];<\/code>\u3002\u8fd9\u79cd\u65b9\u6cd5\u76f4\u63a5\u5c55\u73b0\u4e86\u6570\u7ec4\u7684\u7ed3\u6784\uff0c\u4f7f\u4ee3\u7801\u7684\u9605\u8bfb\u548c\u7ef4\u62a4\u6210\u672c\u964d\u4f4e\u3002\u6b64\u5916\uff0c\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u4e0d\u9700\u8981\u8c03\u7528\u6784\u9020\u51fd\u6570\uff0c\u56e0\u800c\u5728\u6267\u884c\u6548\u7387\u4e0a\u76f8\u5bf9\u8f83\u9ad8\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf<\/p>\n<\/p>\n

\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u662f\u5b9a\u4e49\u6570\u7ec4\u6700\u7b80\u4fbf\u7684\u65b9\u5f0f\u3002\u53ea\u9700\u5728\u65b9\u62ec\u53f7\u5185\u52a0\u5165\u5143\u7d20\u5e76\u7528\u9017\u53f7\u5206\u9694\u5f00\u5373\u53ef\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\u3002\u8fd9\u79cd\u65b9\u6cd5\u76f4\u89c2\u3001\u7b80\u6d01\uff0c\u975e\u5e38\u9002\u5408\u5b9a\u4e49\u4e00\u4e9b\u9759\u6001\u7684\u3001\u5143\u7d20\u5df2\u77e5\u7684\u6570\u7ec4\u3002<\/p>\n<\/p>\n

\u4f8b\u5982, \u5b9a\u4e49\u4e00\u4e2a\u5305\u542b\u51e0\u79cd\u6c34\u679c\u540d\u79f0\u7684\u6570\u7ec4\uff1a<\/p>\n<\/p>\n

let fruits = ["apple", "banana", "cherry"];<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\u5b9a\u4e49\u7684\u597d\u5904\u5728\u4e8e\u7f16\u5199\u4ee3\u7801\u65f6\u7684\u76f4\u89c2\u6027\u4e0e\u7b80\u6613\u6027\u3002\u5f53\u6570\u7ec4\u7684\u5143\u7d20\u5728\u4e66\u5199\u4ee3\u7801\u65f6\u5df2\u7ecf\u660e\u786e\uff0c\u90a3\u4e48\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u5c31\u975e\u5e38\u5408\u9002\u3002\u53ef\u8bfb\u6027\u9ad8\uff0c\u4e14\u65e0\u9700\u591a\u4f59\u7684\u51fd\u6570\u8c03\u7528\uff0c\u6027\u80fd\u8f83\u597d\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528Array\u6784\u9020\u51fd\u6570<\/p>\n<\/p>\n
\u4f7f\u7528Array\u6784\u9020\u51fd\u6570\u521b\u5efa\u6570\u7ec4\uff0c\u53ef\u4ee5\u5728\u521b\u5efa\u65f6\u5c31\u6307\u5b9a\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u6216\u76f4\u63a5\u5728\u6784\u9020\u51fd\u6570\u4e2d\u4f20\u5165\u6570\u7ec4\u5143\u7d20\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u7075\u6d3b\u6027\u66f4\u9ad8\uff0c\u5c24\u5176\u9002\u7528\u4e8e\u5f53\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u6307\u5b9a\u957f\u5ea6\uff0c\u4f46\u5143\u7d20\u6682\u65f6\u672a\u77e5\u7684\u6570\u7ec4\u3002<\/p>\n<\/p>\n
\u4f8b1 – \u521b\u5efa\u4e00\u4e2a\u6307\u5b9a\u957f\u5ea6\u7684\u7a7a\u6570\u7ec4\uff1a<\/p>\n<\/p>\n
let cars = new Array(5);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f8b2 – \u5728\u6784\u9020\u51fd\u6570\u4e2d\u76f4\u63a5\u4f20\u5165\u6570\u7ec4\u5143\u7d20\uff1a<\/p>\n<\/p>\n
let colors = new Array("red", "green", "blue");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5c3d\u7ba1\u4f7f\u7528Array\u6784\u9020\u51fd\u6570\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u7075\u6d3b\u6027\uff0c\u4f46\u5f53\u76f4\u63a5\u4f20\u5165\u5355\u4e2a\u6570\u503c\u53c2\u6570\u65f6\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u6307\u5b9a\u957f\u5ea6\u7684\u7a7a\u6570\u7ec4\uff0c\u800c\u4e0d\u662f\u5305\u542b\u5355\u4e2a\u6570\u503c\u7684\u6570\u7ec4\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u6df7\u6dc6\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Array.of\u4e0eArray.from\u65b9\u6cd5<\/p>\n<\/p>\n
Array.of<\/code>\u65b9\u6cd5\u548cArray.from<\/code>\u65b9\u6cd5\u63d0\u4f9b\u4e86\u66f4\u4e3a\u9ad8\u7ea7\u7684\u6570\u7ec4\u521b\u5efa\u80fd\u529b\uff0c\u5b83\u4eec\u9002\u7528\u4e8e\u66f4\u590d\u6742\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
    \n
  • \n
    Array.of()<\/strong>\uff1a\u89e3\u51b3\u4e86\u4f7f\u7528Array\u6784\u9020\u51fd\u6570\u65f6\uff0c\u5355\u4e2a\u6570\u503c\u53c2\u6570\u4f1a\u88ab\u89e3\u91ca\u4e3a\u6570\u7ec4\u957f\u5ea6\u7684\u95ee\u9898\u3002Array.of()\u65b9\u6cd5\u5141\u8bb8\u76f4\u63a5\u521b\u5efa\u5305\u542b\u4efb\u610f\u6570\u91cf\u5143\u7d20\u7684\u6570\u7ec4\uff0c\u65e0\u8bba\u53c2\u6570\u662f\u5355\u4e2a\u8fd8\u662f\u591a\u4e2a\u3002<\/p>\n<\/p>\n
    \u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
    let digits = Array.of(1, 2, 3);<\/p>\n
    <\/code><\/pre>\n<\/p>\n<\/li>\n
  • \n
    Array.from()<\/strong>\uff1a\u5f3a\u5927\u4e4b\u5904\u5728\u4e8e\u80fd\u4ece\u7c7b\u6570\u7ec4\u5bf9\u8c61\u6216\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u521b\u5efa\u65b0\u7684\u3001\u6d45\u62f7\u8d1d\u7684\u6570\u7ec4\u5b9e\u4f8b\u3002\u5b83\u975e\u5e38\u9002\u7528\u4e8e\u5c06\u975e\u6570\u7ec4\u5bf9\u8c61\u8f6c\u6362\u4e3a\u6570\u7ec4\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
    \u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
    let name = "JavaScript";<\/p>\n
    let letters = Array.from(name);<\/p>\n
    <\/code><\/pre>\n<\/p>\n<\/li>\n<\/ul>\n
    \u56db\u3001\u603b\u7ed3\u4e0e\u63a8\u8350<\/p>\n<\/p>\n
    \u5728\u5b9a\u4e49\u6570\u7ec4\u65f6\uff0c\u9996\u9009\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\uff0c\u56e0\u5176\u7b80\u6d01\u6027\u548c\u76f4\u89c2\u6027\u3002\u5f53\u9700\u8981\u66f4\u9ad8\u7684\u7075\u6d3b\u6027\u6216\u5904\u7406\u7279\u6b8a\u573a\u666f\u65f6\uff0c\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u9700\u8981\u9009\u62e9Array\u6784\u9020\u51fd\u6570\u6216Array.of\u3001Array.from\u65b9\u6cd5\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\uff0c\u5408\u7406\u9009\u62e9\u53ef\u4ee5\u8ba9\u4ee3\u7801\u66f4\u6709\u6548\u7387\uff0c\u4e5f\u66f4\u6613\u4e8e\u7ef4\u62a4\u548c\u7406\u89e3\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
    1. \u524d\u7aef javascript \u4ee3\u7801\u4e2d\u5982\u4f55\u5b9a\u4e49\u6570\u7ec4\uff1f<\/strong>
    \n\u5728\u524d\u7aef JavaScript \u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\u6765\u5b9a\u4e49\u6570\u7ec4\uff1a<\/p>\n
      \n
    • \u4f7f\u7528\u5b57\u9762\u91cf\u8bed\u6cd5\uff1a\u4f8b\u5982 var arr = []<\/code>\uff0c\u8fd9\u6837\u5c31\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u6570\u7ec4\u3002<\/li>\n
    • \u4f7f\u7528 new<\/code> \u5173\u952e\u5b57\u548c\u6570\u7ec4\u6784\u9020\u51fd\u6570\uff1a\u4f8b\u5982 var arr = new Array()<\/code>\uff0c\u540c\u6837\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u6570\u7ec4\u3002<\/li>\n
    • \u5b9a\u4e49\u5e26\u6709\u521d\u59cb\u503c\u7684\u6570\u7ec4\uff1a\u4f8b\u5982 var arr = [1, 2, 3]<\/code>\uff0c\u8fd9\u6837\u5c31\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u521d\u59cb\u5143\u7d20\u7684\u6570\u7ec4\u3002<\/li>\n<\/ul>\n
      2. \u5982\u4f55\u7ed9\u6570\u7ec4\u6dfb\u52a0\u6216\u66f4\u65b0\u5143\u7d20\uff1f<\/strong>
      \n\u8981\u7ed9\u6570\u7ec4\u6dfb\u52a0\u6216\u66f4\u65b0\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n
        \n
      • \u901a\u8fc7\u7d22\u5f15\u76f4\u63a5\u8d4b\u503c\uff1a\u4f8b\u5982 arr[0] = 'apple'<\/code>\uff0c\u53ef\u4ee5\u5c06\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u8bbe\u7f6e\u4e3a\u5b57\u7b26\u4e32 'apple'\u3002<\/li>\n
      • \u4f7f\u7528 push()<\/code> \u65b9\u6cd5\uff1a\u4f8b\u5982 arr.push('orange')<\/code>\uff0c\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32 'orange' \u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u672b\u5c3e\u3002<\/li>\n
      • \u4f7f\u7528 unshift()<\/code> \u65b9\u6cd5\uff1a\u4f8b\u5982 arr.unshift('banana')<\/code>\uff0c\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32 'banana' \u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u5f00\u5934\u3002<\/li>\n<\/ul>\n
        3. \u5982\u4f55\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\u548c\u8bbf\u95ee\u5143\u7d20\uff1f<\/strong>
        \n\u8981\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u53ef\u4ee5\u4f7f\u7528 length<\/code> \u5c5e\u6027\uff0c\u4f8b\u5982 var length = arr.length<\/code>\u3002\u8981\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u6765\u83b7\u53d6\uff0c\u7d22\u5f15\u4ece 0 \u5f00\u59cb\u3002\u4f8b\u5982\uff0c\u8981\u8bbf\u95ee\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528 arr[0]<\/code>\u3002\u5982\u679c\u8981\u904d\u5386\u6574\u4e2a\u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u7ed3\u6784\uff08\u5982 for<\/code> \u5faa\u73af\uff09\u6765\u8bbf\u95ee\u6bcf\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728JavaScript\u4e2d\uff0c\u5b9a\u4e49\u6570\u7ec4\u7684\u65b9\u6cd5\u4e3b\u8981\u5305\u62ec\u4e09\u79cd\uff1a\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u3001\u4f7f\u7528Array\u6784\u9020\u51fd\u6570\u4ee5\u53ca\u4f7f\u7528Array […]","protected":false},"author":3,"featured_media":266186,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/266182"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=266182"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/266182\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/266186"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=266182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=266182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=266182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}