{"id":188,"date":"2015-05-20T13:28:33","date_gmt":"2015-05-20T05:28:33","guid":{"rendered":"http:\/\/yusemo.com\/?p=188"},"modified":"2023-03-15T10:05:42","modified_gmt":"2023-03-15T02:05:42","slug":"%e6%95%b0%e7%bb%84%e5%8e%bb%e9%87%8d%e7%9a%84%e4%b8%80%e4%ba%9b%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/yusemo.com\/?p=188","title":{"rendered":"\u6570\u7ec4\u53bb\u91cd\u7684\u4e00\u4e9b\u603b\u7ed3"},"content":{"rendered":"

\u5e9f\u8bdd\u4e0d\u591a\u8bf4\u76f4\u63a5\u4e0a\u9898\u76ee\uff01\u5173\u4e8e\u6570\u7ec4\u53bb\u91cd\u7684\u4f8b\u5b50<\/p>\n

\u6570\u7ec4arr1\u548carr2\uff0c\u957f\u5ea6\u4e0d\u56fa\u5b9a\uff0c\u5982\u4f55\u4ecearr1\u4e2d\u5220\u9664\u548carr2\u4e2d\u91cd\u590d\u503c\u7684\u5143\u7d20\uff1f<\/p>\n

\u5982\uff1a<\/p>\n

\r\n\r\nvar arr1=[1,3,4,6,7];\r\n\r\nvar arr2=[3,4,7];\r\n\r\n====>\r\n\r\nvar arr3=[1,6]\r\n\r\nconsole.log()\r\n\r\n<\/pre>\n
\/\/* \u00a0==================================================================================*\/\/<\/p>\n
\u601d\u8def1\uff1a<\/p>\n
\u5047\u5982\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5168\u662f\u6570\u5b57\u53ef\u4ee5\u76f4\u63a5\u5229\u7528\u6b63\u5219\u5339\u914d<\/p>\n
console.log\uff08arr1.concat\uff08arr2\uff09.sort().join(”).replace(\/(w)1+\/g,”).split(”))<\/p>\n
\u601d\u8def2\uff1a<\/p>\n
\u6570\u7ec4\u4e2d\u5305\u542b\u5176\u4ed6\u7c7b\u578b\u7684\u5b57\u7b26\uff0c\u6bd4\u5982\uff1a<\/p>\n
var arr=[1,2,3,’1′,’2′,’3′,1,2]<\/p>\n
\u5229\u7528hash\u8868\u3002\u628a\u5df2\u7ecf\u51fa\u73b0\u8fc7\u7684\u901a\u8fc7\u4e0b\u6807\u7684\u5f62\u5f0f\u5b58\u5165\u4e00\u4e2aobject\u5185\u3002\u4e0b\u6807\u7684\u5f15\u7528\u8981\u6bd4\u7528indexOf\u641c\u7d22\u6570\u7ec4\u5feb\u5f88\u591a\u3002<\/p>\n
\u4f46\u662f\u5185\u5b58\u5360\u7528\u65b9\u9762\u5e94\u8be5\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u6bd4\u8f83\u591a\uff0c\u56e0\u4e3a\u591a\u4e86\u4e00\u4e2ahash\u8868\u3002\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u7a7a\u95f4\u6362\u65f6\u95f4\u3002<\/p>\n
\r\n\r\nArray.prototype.unique2 = function(){\r\n    var n = {},r=[]; \/\/n\u4e3ahash\u8868\uff0cr\u4e3a\u4e34\u65f6\u6570\u7ec4\r\n    for(var i = 0; i < this.length; i++) \/\/\u904d\u5386\u5f53\u524d\u6570\u7ec4\r\n      {\r\n         if (!n[this[i]]) {\r\n           \/\/\u5982\u679chash\u8868\u4e2d\u6ca1\u6709\u5f53\u524d\u9879\r\n             n[this[i]] = true; \/\/\u5b58\u5165hash\u8868\r\n             r.push(this[i]); \/\/\u628a\u5f53\u524d\u6570\u7ec4\u7684\u5f53\u524d\u9879push\u5230\u4e34\u65f6\u6570\u7ec4\u91cc\u9762\r\n          }\r\n      }\r\n      return r;\r\n}\r\n\r\nconsole.log([1,2,3,'1','2','3',1,2].unique2())\r\n\r\n<\/pre>\n
\u601d\u8def3\uff1a<\/p>\n
\u5148\u628a\u6570\u7ec4\u6392\u5e8f\uff0c\u7136\u540e\u6bd4\u8f83\u76f8\u90bb\u7684\u4e24\u4e2a\u503c\u3002\u00a0\u6392\u5e8f\u7684\u65f6\u5019\u7528\u7684JS\u539f\u751f\u7684sort\u65b9\u6cd5\uff0cJS\u5f15\u64ce\u5185\u90e8\u5e94\u8be5\u662f\u7528\u7684\u5feb\u901f\u6392\u5e8f\u3002<\/p>\n
\r\n\r\nArray.prototype.unique3 = function(){\r\n    this.sort();\r\n    var re=[this[0]];\r\n    for(var i = 1; i < this.length; i++){\r\n       if( this[i] !== re[re.length-1]){\r\n           re.push(this[i]);\r\n       }\r\n    }\r\n    return re;\r\n}\r\n\r\n<\/pre>\n
\u601d\u8def4\uff1a<\/p>\n
\u5229\u7528\u6570\u7ec4\u7684indexOf\u65b9\u6cd5\u3002\u6b64\u65b9\u6cd5\u7684\u76ee\u7684\u662f\u5bfb\u627e\u5b58\u5165\u53c2\u6570\u5728\u6570\u7ec4\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u5f88\u663e\u7136\uff0cjs\u5f15\u64ce\u5728\u5b9e\u73b0\u8fd9\u4e2a\u65b9\u6cd5\u7684\u65f6\u5019\u4f1a\u904d\u5386\u6570\u7ec4\u76f4\u5230\u627e\u5230\u76ee\u6807\u4e3a\u6b62\u3002\u6240\u4ee5\u6b64\u51fd\u6570\u4f1a\u6d6a\u8d39\u6389\u5f88\u591a\u65f6\u95f4\u3002<\/p>\n
\r\n\r\nArray.prototype.unique4 = function(){\r\n    var n = [this[0]]; \/\/\u7ed3\u679c\u6570\u7ec4\r\n    for(var i = 1; i < this.length; i++) \/\/\u4ece\u7b2c\u4e8c\u9879\u5f00\u59cb\u904d\u5386\r\n    { \/\/\u5982\u679c\u5f53\u524d\u6570\u7ec4\u7684\u7b2ci\u9879\u5728\u5f53\u524d\u6570\u7ec4\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u4e0d\u662fi\uff0c\r\n      \/\/\u90a3\u4e48\u8868\u793a\u7b2ci\u9879\u662f\u91cd\u590d\u7684\uff0c\u5ffd\u7565\u6389\u3002\u5426\u5219\u5b58\u5165\u7ed3\u679c\u6570\u7ec4\r\n      if (this.indexOf(this[i]) == i) n.push(this[i]);\r\n    }\r\n\r\n    return n;\r\n}\r\n\r\n<\/pre>\n
\/\/* \u00a0===============================   \u66f4\u65b0\u65b0\u7684es5\u65b9\u6cd5  ===========================*\/\/<\/p>\n
1\u3001\u501f\u52a9\u6808\u7684\u65b9\u6cd5<\/p>\n
\r\nlet unique = arr => {\r\n  let res = [];\r\n  while (arr.length > 0) {\r\n    let item = arr.shift();\r\n    res.indexOf(item) === -1 && res.push(item);\r\n  }\r\n  return res;\r\n};\r\nconsole.log(unique([1, 4, 5, 6, 6, 7, 7, 999, 999, 8, 7, 999]));\r\n<\/pre>\n
2\u3001Array from + Set \u65b9\u6cd5
\n\u4e0d\u8003\u8651\u517c\u5bb9\u6027\uff0c\u8fd9\u79cd\u53bb\u91cd\u7684\u65b9\u6cd5\u4ee3\u7801\u6700\u5c11\u3002\u4f46\u662f\u65e0\u6cd5\u53bb\u6389\u201c{}\u201d\u7a7a\u5bf9\u8c61<\/p>\n
\r\n\r\nfunction unique (arr) { \r\n\treturn Array.from(new Set(arr)) \r\n}\r\nvar arr = [1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}];\r\nconsole.log(unique(arr))\r\n\/\/[1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {}, {}]\r\n\r\n<\/pre>\n
3\u3001Set \u65b9\u6cd5
\n\u8fd9\u79cd\u53bb\u91cd\u7684\u65b9\u6cd5\u4ee3\u7801\u6700\u5c11\u3002\u4f46\u662fset\u7684\u4e00\u4e2a\u6700\u5927\u7684\u7279\u70b9\u5c31\u662f\u6570\u636e\u4e0d\u91cd\u590d<\/p>\n
\r\n\r\nfunction unique(arr) {\r\n  return [...new Set(arr)];\r\n}\r\n\r\nconsole.log(unique([1, 2, 2, 3, 4, 4]));\r\n<\/pre>\n
4\u3001indexOf() + lastIndexOf()\u65b9\u6cd5<\/p>\n
\r\nlet unique = arr => {\r\n  let result = [];\r\n  arr.forEach((item, index) => {\r\n    if (arr.indexOf(item, index) === arr.lastIndexOf(item) && result.indexOf(item) === -1) {\r\n      result.push(item);\r\n    }\r\n  });\r\n  return result;\r\n};\r\n\r\nlet arr = [1, 4, 5, 6, 6, 7, 7, 999, 999, 8, 7, 999];\r\nconsole.log(unique(arr));\r\n\r\n<\/pre>\n
5\u3001includes()\u65b9\u6cd5<\/p>\n
\r\nfunction unique(arr) {\r\n  let res = [];\r\n  arr.forEach(item => {\r\n    if (!res.includes(item)) {\r\n      res.push(item);\r\n    }\r\n  });\r\n  return res;\r\n}\r\n\r\nconsole.log(unique([1, 2, 3, 4, 3, 3, 3, 7, 6, 6, 9, 9]));\r\n<\/pre>\n
6\u3001hasOwnProperty<\/p>\n
\r\nfunction unique(arr) {\r\n\t var obj = {}; \r\n\t return arr.filter(function(item, index, arr){\r\n\t \t return obj.hasOwnProperty(typeof item + item) ? false : (obj[typeof item + item] = true) \r\n\t }) \r\n} \r\nvar arr = [1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}]; \r\nconsole.log(unique(arr)) \r\n\/\/[1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {\u2026}] \r\n\/\/\u6240\u6709 \u7684\u90fd\u53bb\u91cd\u4e86\r\n<\/pre>\n
7\u3001\u5229\u7528reduce+includes<\/p>\n
\r\nfunction unique(arr){\r\n\t return arr.reduce((prev,cur) => prev.includes(cur) ? prev : [...prev,cur], []);\r\n}\r\nvar arr = [1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}]; \r\nconsole.log(unique(arr)); \r\n\/\/ [1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]\r\n\r\n<\/pre>\n
8\u3001\u5229\u7528Map\u6570\u636e\u7ed3\u6784\u53bb\u91cd<\/p>\n
\r\nfunction arrayNonRepeatfy(arr) {\r\n\t let map = new Map(); \r\n\t let array = new Array(); \/\/ \u6570\u7ec4\u7528\u4e8e\u8fd4\u56de\u7ed3\u679c \r\n\t for (let i = 0; i < arr.length; i++) {\r\n\t \t if(map .has(arr[i])) {\/\/ \u5982\u679c\u6709\u8be5key\u503c \r\n\t \t \t map .set(arr[i], true); \r\n\t \t } \r\n\t \t else {\r\n\t \t \t map .set(arr[i], false); \/\/ \u5982\u679c\u6ca1\u6709\u8be5key\u503c \r\n\t \t \t array .push(arr[i]);\r\n\t \t  } \r\n\t }\r\n\t return array ; \r\n}\r\nvar arr = [1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}]; \r\nconsole.log(unique(arr)) \r\n\/\/[1, \"a\", \"true\", true, 15, false, 1, {\u2026}, null, NaN, NaN, \"NaN\", 0, \"a\", {\u2026}, undefined]\r\n<\/pre>\n
9\u3001\u5229\u7528filter<\/p>\n
\r\n\r\nfunction unique(arr) { \r\n\treturn arr.filter(function(item, index, arr) {\r\n\t \t\/\/\u5f53\u524d\u5143\u7d20\uff0c\u5728\u539f\u59cb\u6570\u7ec4\u4e2d\u7684\u7b2c\u4e00\u4e2a\u7d22\u5f15 === \u5f53\u524d\u7d22\u5f15\u503c\uff0c\u5426\u5219\u8fd4\u56de\u5f53\u524d\u5143\u7d20 \r\n\t \treturn arr.indexOf(item, 0) === index; \r\n\t }); \r\n}\r\n var arr = [1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}]; console.log(unique(arr)) \r\n \/\/[1, \"true\", true, 15, false, undefined, null, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]\r\n\r\n<\/pre>\n
10\u3001\u7b80\u5316map+filter \u53bb\u91cd<\/p>\n
\r\n\r\nfunction unique(arr) { \r\n\tconst res = new Map(); \/\/\u5b9a\u4e49\u5e38\u91cf res,\u503c\u4e3a\u2f00\u4e2aMap\u5bf9\u8c61\u5b9e\u4f8b\r\n \u3000\u3000 \/\/\u8fd4\u56dearr\u6570\u7ec4\u8fc7\u6ee4\u540e\u7684\u7ed3\u679c\uff0c\u7ed3\u679c\u4e3a\u2f00\u4e2a\u6570\u7ec4 \u8fc7\u6ee4\u6761\u4ef6\u662f\uff0c\u5982\u679cres\u4e2d\u6ca1\u6709\u67d0\u4e2a\u952e\u5982no\uff0c\u5982\u6ca1\u952e\u503c\u5c31\u76f4\u63a5arr\uff0c\u5c31\u8bbe\u7f6e\u8fd9\u4e2a\u952e\u7684\u503c\u4e3a1  \u3000\u3000\r\n     return arr.filter((arr) => !res.has(arr.no) && res.set(arr.no, 1)) \r\n}\r\n var arr = [1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}]; console.log(unique(arr)) \r\n \/\/[1, \"true\", true, 15, false, undefined, null, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5e9f\u8bdd\u4e0d\u591a\u8bf4\u76f4\u63a5\u4e0a\u9898\u76ee\uff01\u5173\u4e8e\u6570\u7ec4\u53bb\u91cd\u7684\u4f8b\u5b50 \u6570\u7ec4arr1\u548carr2\uff0c\u957f\u5ea6\u4e0d\u56fa\u5b9a\uff0c\u5982\u4f55\u4ecearr1\u4e2d\u5220\u9664\u548carr2\u4e2d […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/yusemo.com\/index.php?rest_route=\/wp\/v2\/posts\/188"}],"collection":[{"href":"https:\/\/yusemo.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yusemo.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yusemo.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yusemo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=188"}],"version-history":[{"count":10,"href":"https:\/\/yusemo.com\/index.php?rest_route=\/wp\/v2\/posts\/188\/revisions"}],"predecessor-version":[{"id":382,"href":"https:\/\/yusemo.com\/index.php?rest_route=\/wp\/v2\/posts\/188\/revisions\/382"}],"wp:attachment":[{"href":"https:\/\/yusemo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yusemo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yusemo.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}