{"id":159676,"date":"2024-05-08T13:15:02","date_gmt":"2024-05-08T05:15:02","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/159676.html"},"modified":"2024-05-08T13:15:08","modified_gmt":"2024-05-08T05:15:08","slug":"%e5%89%8d%e7%ab%af-javascript-%e6%80%8e%e4%b9%88%e8%bf%87%e6%bb%a4%e6%95%b0%e7%bb%84%e9%87%8d%e5%a4%8d%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/159676.html","title":{"rendered":"\u524d\u7aef javascript \u600e\u4e48\u8fc7\u6ee4\u6570\u7ec4\u91cd\u590d\u5143\u7d20"},"content":{"rendered":"

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

\u8fc7\u6ee4\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\u662fJavaScript\u4e2d\u5e38\u89c1\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u901a\u8fc7\u51e0\u79cd\u65b9\u6cd5\u89e3\u51b3\uff0c\u5982\u4f7f\u7528Set\u5bf9\u8c61\u3001\u4f7f\u7528filter\u65b9\u6cd5\u7ed3\u5408indexOf\u3001\u4f7f\u7528reduce\u65b9\u6cd5<\/strong>\u7b49\u3002\u4f7f\u7528Set\u5bf9\u8c61\u662f\u6700\u7b80\u6d01\u7684\u65b9\u5f0f<\/strong>\u3002Set\u662fES6\u4e2d\u5f15\u5165\u7684\u4e00\u79cd\u65b0\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u7c7b\u4f3c\u4e8e\u6570\u7ec4\uff0c\u4f46\u6210\u5458\u7684\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u6ca1\u6709\u91cd\u590d\u7684\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u7b80\u6d01\u6613\u61c2\uff0c\u4ee3\u7801\u91cf\u5c11\u3002\u5177\u4f53\u800c\u8a00\uff0c\u53ea\u9700\u8981\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3aSet\uff0c\u518d\u5c06Set\u8f6c\u6362\u56de\u6570\u7ec4\u5373\u53ef\u5b9e\u73b0\u53bb\u91cd\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528SET\u5bf9\u8c61<\/h3>\n<\/p>\n

Set\u5bf9\u8c61\u5141\u8bb8\u4f60\u5b58\u50a8\u4efb\u4f55\u7c7b\u578b\u7684\u552f\u4e00\u503c\uff0c\u4e0d\u8bba\u662f\u539f\u59cb\u503c\u6216\u8005\u662f\u5bf9\u8c61\u5f15\u7528\u3002\u4f7f\u7528Set\u5bf9\u8c61\u8fdb\u884c\u6570\u7ec4\u53bb\u91cd\u5341\u5206\u7b80\u5355\uff1a<\/p>\n<\/p>\n

const array = [1, 2, 3, 4, 2, 3];<\/p>\n
const uniqueArray = [...new Set(array)];<\/p>\n
console.log(uniqueArray); \/\/ \u8f93\u51fa: [1, 2, 3, 4]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\uff0cnew Set(array)<\/code>\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684Set\u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7\u5c55\u5f00\u8fd0\u7b97\u7b26...<\/code>\u5c06\u5176\u8f6c\u5316\u56de\u6570\u7ec4\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u91cd\u590d\u7684\u5143\u7d20\u81ea\u7136\u88ab\u8fc7\u6ee4\u6389\u4e86\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4e3b\u8981\u4f18\u70b9\u662f\u7b80\u5355\u5feb\u6377\uff0c\u4ee3\u7801\u91cf\u5c11\uff0c\u6613\u4e8e\u7406\u89e3\u548c\u5b9e\u65bd\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528FILTER\u65b9\u6cd5\u7ed3\u5408INDEXOF<\/h3>\n<\/p>\n
\u53e6\u4e00\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u6570\u7ec4\u7684filter<\/code>\u65b9\u6cd5\u7ed3\u5408indexOf<\/code>\u65b9\u6cd5\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u6838\u5fc3\u662f\u5229\u7528filter<\/code>\u65b9\u6cd5\u904d\u5386\u6570\u7ec4\uff0c\u5e76\u901a\u8fc7indexOf<\/code>\u65b9\u6cd5\u68c0\u67e5\u5143\u7d20\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u8be5\u4f4d\u7f6e\u4e0e\u5f53\u524d\u5143\u7d20\u4f4d\u7f6e\u76f8\u540c\uff0c\u5219\u4fdd\u7559\u8be5\u5143\u7d20\u3002<\/p>\n<\/p>\n
const array = [1, 2, 3, 4, 2, 3];<\/p>\n
const uniqueArray = array.filter((item, index) => {<\/p>\n
    return array.indexOf(item) === index;<\/p>\n
});<\/p>\n
console.log(uniqueArray); \/\/ \u8f93\u51fa: [1, 2, 3, 4]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u517c\u5bb9\u6027\u597d\uff0c\u53ef\u4ee5\u5728\u4e0d\u652f\u6301ES6\u7684\u73af\u5883\u4e2d\u4f7f\u7528\u3002\u4f46\u5b83\u7684\u6548\u7387\u7565\u4f4e\u4e8e\u4f7f\u7528Set\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5bf9\u4e8e\u6bcf\u4e2a\u5143\u7d20\u6765\u8bf4\uff0cindexOf<\/code>\u90fd\u4f1a\u904d\u5386\u6570\u7ec4\u6765\u67e5\u627e\u8be5\u5143\u7d20\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528REDUCE\u65b9\u6cd5<\/h3>\n<\/p>\n
\u6700\u540e\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7reduce<\/code>\u65b9\u6cd5\u6765\u8fc7\u6ee4\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\u3002reduce<\/code>\u65b9\u6cd5\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6309\u987a\u5e8f\u6267\u884c\u4e00\u4e2a\u7531\u4f60\u63d0\u4f9b\u7684reducer\u51fd\u6570\uff08\u5347\u5e8f\u6267\u884c\uff09\uff0c\u5c06\u5176\u7ed3\u679c\u6c47\u603b\u4e3a\u5355\u4e2a\u8fd4\u56de\u503c\u3002<\/p>\n<\/p>\n
const array = [1, 2, 3, 4, 2, 3];<\/p>\n
const uniqueArray = array.reduce((acc, current) => {<\/p>\n
    if (acc.indexOf(current) < 0) {<\/p>\n
        acc.push(current);<\/p>\n
    }<\/p>\n
    return acc;<\/p>\n
}, []);<\/p>\n
console.log(uniqueArray); \/\/ \u8f93\u51fa: [1, 2, 3, 4]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u521d\u59cb\u5316\u4e00\u4e2a\u7a7a\u6570\u7ec4\u4f5c\u4e3areduce<\/code>\u7684accumulator\uff08\u7d2f\u52a0\u5668\uff09\uff0c\u7136\u540e\u904d\u5386\u539f\u59cb\u6570\u7ec4\uff0c\u5982\u679c\u7d2f\u52a0\u5668\u4e2d\u8fd8\u6ca1\u6709\u5f53\u524d\u5143\u7d20\uff0c\u5c31\u5c06\u5176\u6dfb\u52a0\u8fdb\u53bb\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u5728\u8fc7\u6ee4\u91cd\u590d\u5143\u7d20\u7684\u540c\u65f6\u8fdb\u884c\u5176\u4ed6\u8f6c\u6362\u64cd\u4f5c\uff0c\u4f46\u5b83\u7684\u6548\u7387\u540c\u6837\u4e0d\u5982\u4f7f\u7528Set\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u56db\u3001\u6027\u80fd\u8003\u91cf\u4e0e\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u5728\u8003\u8651\u4f7f\u7528\u54ea\u79cd\u65b9\u6cd5\u65f6\uff0c\u4e0d\u4ec5\u8981\u8003\u8651\u4ee3\u7801\u7684\u7b80\u6d01\u6027\uff0c\u8fd8\u5e94\u8be5\u8003\u8651\u5230\u6267\u884c\u6548\u7387\u3002\u4f7f\u7528Set\u5bf9\u8c61\u662f\u6700\u9ad8\u6548\u7684\u65b9\u6cd5<\/strong>\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u578b\u6570\u7ec4\u65f6\u3002\u4f7f\u7528filter<\/code>\u7ed3\u5408indexOf<\/code>\u7684\u65b9\u6cd5\u5728\u5c0f\u578b\u6570\u7ec4\u4e2d\u6548\u7387\u4e5f\u4e0d\u9519\uff0c\u4f46\u5728\u5927\u578b\u6570\u7ec4\u4e2d\u53ef\u80fd\u4f1a\u56e0\u4e3a\u9891\u7e41\u904d\u5386\u800c\u5bfc\u81f4\u6548\u7387\u4e0b\u964d\u3002reduce<\/code>\u65b9\u6cd5\u63d0\u4f9b\u4e86\u9ad8\u5ea6\u7684\u7075\u6d3b\u6027\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5728\u53bb\u91cd\u7684\u540c\u65f6\u8fdb\u884c\u5176\u4ed6\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5e94\u8be5\u6839\u636e\u5177\u4f53\u9700\u6c42\u548c\u73af\u5883\u652f\u6301\u60c5\u51b5\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5f00\u53d1\u7684\u662f\u4e00\u4e2a\u9700\u8981\u517c\u5bb9\u65e7\u7248\u6d4f\u89c8\u5668\u7684\u9879\u76ee\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528filter<\/code>\u7ed3\u5408indexOf<\/code>\u7684\u65b9\u6cd5\uff1b\u82e5\u4f60\u7684\u9879\u76ee\u73af\u5883\u652f\u6301ES6\u4ee5\u4e0a\u7684\u7279\u6027\uff0c\u90a3\u4e48\u4f7f\u7528Set\u5bf9\u8c61\u4f1a\u662f\u6700\u7b80\u6d01\u9ad8\u6548\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u5982\u4f55\u4f7f\u7528JavaScript\u8fdb\u884c\u6570\u7ec4\u53bb\u91cd\u64cd\u4f5c\uff1f<\/strong>
\n\u6570\u7ec4\u53bb\u91cd\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u524d\u7aef\u5f00\u53d1\u9700\u6c42\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\u3002\u4e00\u79cd\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Set\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u81ea\u52a8\u8fc7\u6ee4\u6389\u91cd\u590d\u5143\u7d20\u3002\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3aSet\u5bf9\u8c61\uff0c\u7136\u540e\u518d\u5c06Set\u5bf9\u8c61\u8f6c\u6362\u56de\u6570\u7ec4\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u786e\u4fdd\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u90fd\u662f\u552f\u4e00\u7684\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
\/\/ \u53bb\u91cd\u51fd\u6570\nfunction removeDuplicates(arr) {\n  return Array.from(new Set(arr));\n}\n\n\/\/ \u6d4b\u8bd5\u4ee3\u7801\nlet arr = [1, 2, 2, 3, 4, 4, 5];\nlet uniqueArr = removeDuplicates(arr);\nconsole.log(uniqueArr); \/\/ \u8f93\u51fa [1, 2, 3, 4, 5]\n<\/code><\/pre>\n
2. \u9664\u4e86\u4f7f\u7528Set\u6570\u636e\u7ed3\u6784\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u6570\u7ec4\u53bb\u91cd\u5417\uff1f<\/strong>
\n\u662f\u7684\uff0c\u9664\u4e86\u4f7f\u7528Set\u6570\u636e\u7ed3\u6784\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u4e00\u4e9b\u65b9\u6cd5\u6765\u5b9e\u73b0\u6570\u7ec4\u53bb\u91cd\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u5e38\u89c4\u7684for\u5faa\u73af\u914d\u5408indexOf()\u65b9\u6cd5\u6765\u9010\u4e2a\u904d\u5386\u6570\u7ec4\u5143\u7d20\uff0c\u5e76\u5224\u65ad\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u4e8e\u65b0\u6570\u7ec4\u4e2d\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u5c06\u5176\u6dfb\u52a0\u5230\u65b0\u6570\u7ec4\u4e2d\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
\/\/ \u53bb\u91cd\u51fd\u6570\nfunction removeDuplicates(arr) {\n  let uniqueArr = [];\n  for (let i = 0; i < arr.length; i++) {\n    if (uniqueArr.indexOf(arr[i]) === -1) {\n      uniqueArr.push(arr[i]);\n    }\n  }\n  return uniqueArr;\n}\n\n\/\/ \u6d4b\u8bd5\u4ee3\u7801\nlet arr = [1, 2, 2, 3, 4, 4, 5];\nlet uniqueArr = removeDuplicates(arr);\nconsole.log(uniqueArr); \/\/ \u8f93\u51fa [1, 2, 3, 4, 5]\n<\/code><\/pre>\n
3. \u5728\u8fdb\u884c\u6570\u7ec4\u53bb\u91cd\u65f6\uff0c\u5982\u4f55\u4fdd\u7559\u539f\u6570\u7ec4\u7684\u987a\u5e8f\uff1f<\/strong>
\n\u5982\u679c\u6211\u4eec\u5e0c\u671b\u5728\u6570\u7ec4\u53bb\u91cd\u7684\u540c\u65f6\u4fdd\u7559\u539f\u6570\u7ec4\u7684\u987a\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u79cd\u53eb\u505a"\u53cc\u6307\u9488"\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u4e24\u4e2a\u6307\u9488\uff1a\u4e00\u4e2a\u6307\u5411\u5f53\u524d\u5904\u7406\u7684\u5143\u7d20\uff0c\u53e6\u4e00\u4e2a\u6307\u5411\u5df2\u7ecf\u53bb\u91cd\u7684\u5143\u7d20\u3002\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u904d\u5386\u6570\u7ec4\uff0c\u5e76\u9010\u4e2a\u5224\u65ad\u5f53\u524d\u5143\u7d20\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u4e8e\u53bb\u91cd\u540e\u7684\u6570\u7ec4\u4e2d\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u5c06\u5176\u52a0\u5165\u5230\u53bb\u91cd\u540e\u7684\u6570\u7ec4\uff0c\u5e76\u5c06\u53bb\u91cd\u6307\u9488\u79fb\u52a8\u5230\u4e0b\u4e00\u4e2a\u4f4d\u7f6e\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
\/\/ \u53bb\u91cd\u51fd\u6570\nfunction removeDuplicates(arr) {\n  let uniqueArr = [arr[0]];\n  let pointer = 1;\n  for (let i = 1; i < arr.length; i++) {\n    if (!uniqueArr.includes(arr[i])) {\n      uniqueArr[pointer] = arr[i];\n      pointer++;\n    }\n  }\n  return uniqueArr;\n}\n\n\/\/ \u6d4b\u8bd5\u4ee3\u7801\nlet arr = [1, 2, 2, 3, 4, 4, 5];\nlet uniqueArr = removeDuplicates(arr);\nconsole.log(uniqueArr); \/\/ \u8f93\u51fa [1, 2, 3, 4, 5]\n<\/code><\/pre>\n
\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6570\u7ec4\u7684\u53bb\u91cd\u64cd\u4f5c\uff0c\u5e76\u4e14\u4fdd\u7559\u539f\u6570\u7ec4\u7684\u987a\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u8fc7\u6ee4\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\u662fJavaScript\u4e2d\u5e38\u89c1\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u901a\u8fc7\u51e0\u79cd\u65b9\u6cd5\u89e3\u51b3\uff0c\u5982\u4f7f\u7528Set\u5bf9\u8c61\u3001\u4f7f\u7528filte […]","protected":false},"author":3,"featured_media":159692,"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\/159676"}],"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=159676"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/159676\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/159692"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=159676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=159676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=159676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}