{"id":312255,"date":"2024-05-20T22:34:23","date_gmt":"2024-05-20T14:34:23","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/312255.html"},"modified":"2024-05-20T22:34:29","modified_gmt":"2024-05-20T14:34:29","slug":"%e5%89%8d%e7%ab%af-js-%e9%a1%b9%e7%9b%ae%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e6%a0%b9%e6%8d%ae%e6%9f%90%e4%b8%aa%e5%af%b9%e8%b1%a1%e5%80%bc%e5%8e%bb%e9%87%8d-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/312255.html","title":{"rendered":"\u524d\u7aef Js \u9879\u76ee\u6570\u7ec4\u600e\u4e48\u6839\u636e\u67d0\u4e2a\u5bf9\u8c61\u503c\u53bb\u91cd"},"content":{"rendered":"

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

\u5728\u524d\u7aefJavaScript\uff08JS\uff09\u9879\u76ee\u4e2d\uff0c\u6839\u636e\u67d0\u4e2a\u5bf9\u8c61\u503c\u53bb\u91cd\u662f\u4e00\u4e2a\u5e38\u89c1\u9700\u6c42\uff0c\u4e3b\u8981\u89e3\u51b3\u65b9\u6848\u5305\u62ec\u4f7f\u7528Set\u7ed3\u6784<\/code>\u3001Array.prototype.filter<\/code>\u65b9\u6cd5\u548cmap\u6570\u636e\u7ed3\u6784<\/code><\/strong>\u3002\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u9ad8\u6548\u5730\u5e2e\u52a9\u5f00\u53d1\u8005\u5904\u7406\u6570\u7ec4\u4e2d\u5bf9\u8c61\u7684\u53bb\u91cd\u95ee\u9898\uff0c\u5e76\u4fdd\u7559\u539f\u6709\u987a\u5e8f\u3002\u5176\u4e2d\uff0c\u4f7f\u7528Map\u6570\u636e\u7ed3\u6784<\/code>\u8fdb\u884c\u53bb\u91cd\u662f\u4e00\u79cd\u65e2\u9ad8\u6548\u53c8\u7075\u6d3b\u7684\u65b9\u6cd5\u3002Map\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u552f\u4e00\u503c\u4f5c\u4e3a\u952e\uff0c\u7ed3\u5408\u5176\u904d\u5386\u548c\u68c0\u67e5\u673a\u5236\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u57fa\u4e8e\u5bf9\u8c61\u5c5e\u6027\u7684\u6570\u7ec4\u53bb\u91cd\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528 SET \u7ed3\u6784<\/h3>\n<\/p>\n

\u5728JavaScript ES6\u4e2d\uff0cSet\u662f\u4e00\u79cd\u65b0\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8f7b\u677e\u5b9e\u73b0\u57fa\u672c\u7684\u6570\u7ec4\u53bb\u91cd\u3002\u4f46\u662f\uff0c\u5f53\u6211\u4eec\u9700\u8981\u6839\u636e\u5bf9\u8c61\u7684\u67d0\u4e2a\u5c5e\u6027\u6765\u53bb\u91cd\u65f6\uff0c\u5c31\u9700\u8981\u66f4\u667a\u80fd\u7684\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528Set\u7ed3\u6784\u914d\u5408map\u51fd\u6570\u8fdb\u884c\u53bb\u91cd\u7684\u6b65\u9aa4\uff1a<\/p>\n<\/p>\n

    \n
  1. \u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684Set\u5b9e\u4f8b\uff0c\u5e76\u901a\u8fc7\u904d\u5386\u539f\u6570\u7ec4\uff0c\u5c06\u5bf9\u8c61\u4e2d\u9700\u8981\u6839\u636e\u5176\u53bb\u91cd\u7684\u5c5e\u6027\u503c\u4f5c\u4e3aSet\u7684\u5143\u7d20\u3002<\/li>\n
  2. \u7136\u540e\uff0c\u4f7f\u7528Array.from\u65b9\u6cd5\u6216\u6269\u5c55\u8fd0\u7b97\u7b26\u5c06Set\u8f6c\u6362\u6210\u6570\u7ec4\u3002<\/li>\n
  3. \u6700\u540e\uff0c\u901a\u8fc7map<\/code>\u6216\u5176\u4ed6\u8fed\u4ee3\u65b9\u6cd5\uff0c\u6839\u636e\u5c5e\u6027\u503c\u91cd\u65b0\u7ec4\u88c5\u539f\u59cb\u5bf9\u8c61\u6570\u7ec4\u3002<\/li>\n<\/ol>\n

    \u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u7f16\u7801\u7b80\u5355\u3001\u6613\u4e8e\u7406\u89e3\u3002\u4f46\u5176\u5c40\u9650\u6027\u5728\u4e8e\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\u53ef\u80fd\u4f1a\u6709\u6027\u80fd\u74f6\u9888\u3002<\/p>\n<\/p>\n

    \u4e8c\u3001\u4f7f\u7528 ARRAY.PROTOTYPE.FILTER \u65b9\u6cd5<\/h3>\n<\/p>\n

    Array.prototype.filter\u662fJS\u539f\u751f\u63d0\u4f9b\u6765\u7b5b\u9009\u6570\u7ec4\u5143\u7d20\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u7ed3\u5408\u4f7f\u7528filter\u65b9\u6cd5\u548cfindIndex\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u6839\u636e\u5bf9\u8c61\u7684\u6307\u5b9a\u5c5e\u6027\u8fdb\u884c\u53bb\u91cd\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<\/p>\n

      \n
    1. \u4f7f\u7528filter\u65b9\u6cd5\u904d\u5386\u6570\u7ec4\u3002<\/li>\n
    2. \u5728filter\u7684\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u4f7f\u7528findIndex\u65b9\u6cd5\u627e\u5230\u5f53\u524d\u5143\u7d20\u9996\u6b21\u51fa\u73b0\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<\/li>\n
    3. \u5982\u679c\u5f53\u524d\u5143\u7d20\u7684\u7d22\u5f15\u4f4d\u7f6e\u4e0efindIndex\u8fd4\u56de\u7684\u7d22\u5f15\u76f8\u540c\uff0c\u5219\u4fdd\u7559\u8fd9\u4e2a\u5143\u7d20\u3002<\/li>\n<\/ol>\n

      \u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u4e0d\u9700\u8981\u5f15\u5165\u989d\u5916\u7684\u6570\u636e\u7ed3\u6784\uff0c\u76f4\u89c2\u4e14\u4e0d\u6539\u53d8\u539f\u6570\u7ec4\u3002\u5b83\u9002\u5408\u7528\u5728\u53bb\u91cd\u903b\u8f91\u4e0d\u590d\u6742\u4e14\u5bf9\u6267\u884c\u6548\u7387\u8981\u6c42\u4e0d\u662f\u7279\u522b\u9ad8\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n

      \u4e09\u3001\u4f7f\u7528 MAP \u6570\u636e\u7ed3\u6784<\/h3>\n<\/p>\n

      Map\u6570\u636e\u7ed3\u6784\u5728ES6\u4e2d\u5f15\u5165\uff0c\u63d0\u4f9b\u4e86\u66f4\u52a0\u7075\u6d3b\u7684\u952e\u503c\u5bf9\u5b58\u50a8\u673a\u5236\u3002\u5bf9\u4e8e\u590d\u6742\u7684\u6570\u636e\u53bb\u91cd\uff0c\u7279\u522b\u662f\u5bf9\u8c61\u6570\u7ec4\u7684\u53bb\u91cd\uff0cMap\u663e\u5f97\u5c24\u4e3a\u6709\u529b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528Map\u8fdb\u884c\u53bb\u91cd\u7684\u5177\u4f53\u6d41\u7a0b\uff1a<\/p>\n<\/p>\n

        \n
      1. \u521b\u5efa\u4e00\u4e2a\u65b0\u7684Map\u5b9e\u4f8b\uff0c\u5728\u904d\u5386\u6570\u7ec4\u65f6\uff0c\u4ee5\u5bf9\u8c61\u7684\u6307\u5b9a\u5c5e\u6027\u503c\u4f5c\u4e3a\u952e\uff0c\u6574\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u503c\u5b58\u5165Map\u4e2d\u3002<\/li>\n
      2. \u7531\u4e8eMap\u7684\u952e\u662f\u552f\u4e00\u7684\uff0c\u6240\u4ee5\u540e\u7eed\u5143\u7d20\u5982\u679c\u4e0e\u524d\u8005\u5c5e\u6027\u503c\u76f8\u540c\uff0c\u5219\u4f1a\u88ab\u5ffd\u7565\uff0c\u4ece\u800c\u5b9e\u73b0\u53bb\u91cd\u3002<\/li>\n
      3. \u6700\u540e\uff0c\u4f7f\u7528Map.values\u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u503c\uff0c\u5c06\u5176\u8f6c\u6362\u6210\u6570\u7ec4\u5373\u53ef\u3002<\/li>\n<\/ol>\n

        \u4f7f\u7528Map\u6570\u636e\u7ed3\u6784\u53bb\u91cd\u7684\u4f18\u52bf\u5728\u4e8e\u5904\u7406\u901f\u5ea6\u5feb\uff0c\u7279\u522b\u662f\u5728\u5927\u6570\u636e\u91cf\u5904\u7406\u4e0a\u8868\u73b0\u7a81\u51fa\u3002\u5b83\u65e2\u4fdd\u7559\u4e86\u5bf9\u8c61\u7684\u5b8c\u6574\u6027\uff0c\u53c8\u907f\u514d\u4e86\u91cd\u590d\u5143\u7d20\u7684\u51fa\u73b0<\/strong>\u3002\u6b64\u5916\uff0cMap\u7684\u7075\u6d3b\u6027\u4f7f\u5f97\u57fa\u4e8e\u591a\u79cd\u6761\u4ef6\u7684\u590d\u6742\u53bb\u91cd\u6210\u4e3a\u53ef\u80fd\u3002<\/p>\n<\/p>\n

        \u7ed3\u8bba<\/h3>\n<\/p>\n

        \u6839\u636e\u9879\u76ee\u7684\u5177\u4f53\u9700\u6c42\u548c\u9762\u5bf9\u7684\u6570\u636e\u91cf\u5927\u5c0f\uff0c\u5f00\u53d1\u8005\u5e94\u9009\u62e9\u6700\u5408\u9002\u7684\u6570\u7ec4\u53bb\u91cd\u65b9\u6cd5\u3002\u5728\u5904\u7406\u7b80\u5355\u6570\u7ec4\u53bb\u91cd\u65f6\uff0cSet\u548cfilter\u65b9\u6cd5\u6216\u8bb8\u66f4\u52a0\u4fbf\u6377\uff1b\u800c\u9762\u5bf9\u5bf9\u8c61\u6570\u7ec4\u6839\u636e\u7279\u5b9a\u5c5e\u6027\u53bb\u91cd\uff0c\u5c24\u5176\u662f\u5728\u6570\u636e\u91cf\u8f83\u5927\u7684\u60c5\u51b5\u4e0b\uff0cMap\u65e0\u7591\u63d0\u4f9b\u4e86\u4e00\u4e2a\u65e2\u9ad8\u6548\u53c8\u7075\u6d3b\u7684\u89e3\u51b3\u65b9\u6848\u3002\u65e0\u8bba\u91c7\u7528\u54ea\u79cd\u65b9\u6cd5\uff0c\u6b63\u786e\u7406\u89e3\u5b83\u4eec\u7684\u539f\u7406\u548c\u9002\u7528\u573a\u666f\u662f\u5173\u952e\u3002<\/p>\n<\/p>\n

        \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

        1. \u5982\u4f55\u5229\u7528 JavaScript \u4e2d\u7684 Set \u65b9\u6cd5\u5bf9\u524d\u7aef\u9879\u76ee\u7684\u6570\u7ec4\u8fdb\u884c\u53bb\u91cd\uff1f<\/strong><\/p>\n

        \u901a\u8fc7\u4f7f\u7528 JavaScript \u4e2d\u7684 Set \u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u5bf9\u524d\u7aef\u9879\u76ee\u4e2d\u7684\u6570\u7ec4\u8fdb\u884c\u53bb\u91cd\u64cd\u4f5c\u3002Set \u65b9\u6cd5\u4f1a\u81ea\u52a8\u53bb\u9664\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\uff0c\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u53bb\u91cd\u540e\u7684\u6570\u7ec4\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

        let arr = [1, 2, 3, 3, 4, 5, 5];\nlet uniqueArr = Array.from(new Set(arr));\nconsole.log(uniqueArr);\n<\/code><\/pre>\n
        2. \u5728\u524d\u7aef\u5f00\u53d1\u4e2d\uff0c\u5982\u4f55\u6839\u636e\u6570\u7ec4\u4e2d\u67d0\u4e2a\u5bf9\u8c61\u7684\u7279\u5b9a\u5c5e\u6027\u503c\u8fdb\u884c\u53bb\u91cd\uff1f<\/strong><\/p>\n
        \u5982\u679c\u4f60\u7684\u524d\u7aef\u9879\u76ee\u4e2d\u7684\u6570\u7ec4\u662f\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u5bf9\u8c61\u7684\u6570\u7ec4\uff0c\u4e14\u4f60\u9700\u8981\u6839\u636e\u67d0\u4e2a\u5bf9\u8c61\u7684\u7279\u5b9a\u5c5e\u6027\u503c\u8fdb\u884c\u53bb\u91cd\uff0c\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u7684 reduce \u65b9\u6cd5\u7ed3\u5408 ES6 \u7684\u7bad\u5934\u51fd\u6570\u6765\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
        let arr = [\n  { id: 1, name: 'John' },\n  { id: 2, name: 'Jane' },\n  { id: 1, name: 'John' },\n  { id: 3, name: 'Alex' }\n];\n\nlet uniqueArr = arr.reduce((unique, item) => {\n  if (!unique.some(obj => obj.id === item.id)) {\n    unique.push(item);\n  }\n  return unique;\n}, []);\n\nconsole.log(uniqueArr);\n<\/code><\/pre>\n
        3. \u5728\u524d\u7aef\u5f00\u53d1\u4e2d\uff0c\u5982\u4f55\u6839\u636e\u6570\u7ec4\u4e2d\u67d0\u4e2a\u5bf9\u8c61\u7684\u591a\u4e2a\u5c5e\u6027\u503c\u8fdb\u884c\u53bb\u91cd\uff1f<\/strong><\/p>\n
        \u5982\u679c\u4f60\u9700\u8981\u6839\u636e\u6570\u7ec4\u4e2d\u67d0\u4e2a\u5bf9\u8c61\u7684\u591a\u4e2a\u5c5e\u6027\u503c\u8fdb\u884c\u53bb\u91cd\uff0c\u53ef\u4ee5\u5728\u4e0a\u8ff0\u7684 reduce \u65b9\u6cd5\u4e2d\u52a0\u5165\u591a\u4e2a\u5224\u65ad\u6761\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
        let arr = [\n  { id: 1, name: 'John', age: 23 },\n  { id: 2, name: 'Jane', age: 28 },\n  { id: 1, name: 'John', age: 25 },\n  { id: 3, name: 'Alex', age: 30 }\n];\n\nlet uniqueArr = arr.reduce((unique, item) => {\n  if (!unique.some(obj => obj.id === item.id && obj.name === item.name && obj.age === item.age)) {\n    unique.push(item);\n  }\n  return unique;\n}, []);\n\nconsole.log(uniqueArr);\n<\/code><\/pre>\n
        \u4ee5\u4e0a\u4ee3\u7801\u5c06\u6839\u636e\u5bf9\u8c61\u7684 id\u3001name \u548c age \u5c5e\u6027\u503c\u8fdb\u884c\u53bb\u91cd\uff0c\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u53bb\u91cd\u540e\u7684\u6570\u7ec4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728\u524d\u7aefJavaScript\uff08JS\uff09\u9879\u76ee\u4e2d\uff0c\u6839\u636e\u67d0\u4e2a\u5bf9\u8c61\u503c\u53bb\u91cd\u662f\u4e00\u4e2a\u5e38\u89c1\u9700\u6c42\uff0c\u4e3b\u8981\u89e3\u51b3\u65b9\u6848\u5305\u62ec\u4f7f\u7528Set\u7ed3\u6784\u3001A […]","protected":false},"author":3,"featured_media":312262,"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\/312255"}],"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=312255"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/312255\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/312262"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=312255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=312255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=312255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}