{"id":3101,"date":"2018-10-22T11:17:14","date_gmt":"2018-10-22T03:17:14","guid":{"rendered":"http:\/\/www.daliane.com\/?p=3101"},"modified":"2018-10-22T18:37:16","modified_gmt":"2018-10-22T10:37:16","slug":"js_shu_zu_qu_zhong_de_12_zhong_chang_jian_fang_fa","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/js_shu_zu_qu_zhong_de_12_zhong_chang_jian_fang_fa\/","title":{"rendered":"JS\u6570\u7ec4\u53bb\u91cd\u768414\u79cd\u5e38\u89c1\u65b9\u6cd5"},"content":{"rendered":"

\n\t\u4e00\u3001\u7b80\u5355\u7684\u53bb\u91cd\u65b9\u6cd5<\/span>\n<\/p>\n

\n\t <\/span>\n<\/p>\n

\/\/ \u6700\u7b80\u5355\u6570\u7ec4\u53bb\u91cd\u6cd5\r\n\/*\r\n* \u65b0\u5efa\u4e00\u65b0\u6570\u7ec4\uff0c\u904d\u5386\u4f20\u5165\u6570\u7ec4\uff0c\u503c\u4e0d\u5728\u65b0\u6570\u7ec4\u5c31push\u8fdb\u8be5\u65b0\u6570\u7ec4\u4e2d\r\n* IE8\u4ee5\u4e0b\u4e0d\u652f\u6301\u6570\u7ec4\u7684indexOf\u65b9\u6cd5\r\n* *\/\r\nfunction uniq(array){\r\n    var temp = []; \/\/\u4e00\u4e2a\u65b0\u7684\u4e34\u65f6\u6570\u7ec4\r\n    for(var i = 0; i < array.length; i++){\r\n        if(temp.indexOf(array[i]) == -1){\r\n            temp.push(array[i]);\r\n        }\r\n    }\r\n    return temp;\r\n}\r\n\r\nvar aa = [1,2,2,4,9,6,7,5,2,3,5,6,5];\r\nconsole.log(uniq(aa));<\/pre>\n
\u4e8c\u3001\u5bf9\u8c61\u952e\u503c\u6cd5\u53bb\u91cd<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t <\/span>\n<\/p>\n
\/*\r\n* \u901f\u5ea6\u6700\u5feb\uff0c \u5360\u7a7a\u95f4\u6700\u591a\uff08\u7a7a\u95f4\u6362\u65f6\u95f4\uff09\r\n*\r\n* \u8be5\u65b9\u6cd5\u6267\u884c\u7684\u901f\u5ea6\u6bd4\u5176\u4ed6\u4efb\u4f55\u65b9\u6cd5\u90fd\u5feb\uff0c \u5c31\u662f\u5360\u7528\u7684\u5185\u5b58\u5927\u4e00\u4e9b\u3002\r\n* \u73b0\u601d\u8def\uff1a\u65b0\u5efa\u4e00js\u5bf9\u8c61\u4ee5\u53ca\u65b0\u6570\u7ec4\uff0c\u904d\u5386\u4f20\u5165\u6570\u7ec4\u65f6\uff0c\u5224\u65ad\u503c\u662f\u5426\u4e3ajs\u5bf9\u8c61\u7684\u952e\uff0c\r\n* \u4e0d\u662f\u7684\u8bdd\u7ed9\u5bf9\u8c61\u65b0\u589e\u8be5\u952e\u5e76\u653e\u5165\u65b0\u6570\u7ec4\u3002\r\n* \u6ce8\u610f\u70b9\uff1a\u5224\u65ad\u662f\u5426\u4e3ajs\u5bf9\u8c61\u952e\u65f6\uff0c\u4f1a\u81ea\u52a8\u5bf9\u4f20\u5165\u7684\u952e\u6267\u884c\u201ctoString()\u201d\uff0c\r\n* \u4e0d\u540c\u7684\u952e\u53ef\u80fd\u4f1a\u88ab\u8bef\u8ba4\u4e3a\u4e00\u6837\uff0c\u4f8b\u5982n[val]-- n[1]\u3001n[\"1\"]\uff1b\r\n* \u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898\u8fd8\u662f\u5f97\u8c03\u7528\u201cindexOf\u201d\u3002*\/\r\nfunction uniq(array){\r\n    var temp = {}, r = [], len = array.length, val, type;\r\n    for (var i = 0; i < len; i++) {\r\n        val = array[i];\r\n        type = typeof val;\r\n        if (!temp[val]) {\r\n            temp[val] = [type];\r\n            r.push(val);\r\n        } else if (temp[val].indexOf(type) < 0) {\r\n            temp[val].push(type);\r\n            r.push(val);\r\n        }\r\n    }\r\n    return r;\r\n}\r\n\r\nvar aa = [1,2,\"2\",4,9,\"a\",\"a\",2,3,5,6,5];\r\nconsole.log(uniq(aa));<\/pre>\n
\u4e09\u3001\u6392\u5e8f\u540e\u76f8\u90bb\u53bb\u9664\u6cd5<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
\/*\r\n* \u7ed9\u4f20\u5165\u6570\u7ec4\u6392\u5e8f\uff0c\u6392\u5e8f\u540e\u76f8\u540c\u503c\u76f8\u90bb\uff0c\r\n* \u7136\u540e\u904d\u5386\u65f6,\u65b0\u6570\u7ec4\u53ea\u52a0\u5165\u4e0d\u4e0e\u524d\u4e00\u503c\u91cd\u590d\u7684\u503c\u3002\r\n* \u4f1a\u6253\u4e71\u539f\u6765\u6570\u7ec4\u7684\u987a\u5e8f\r\n* *\/\r\nfunction uniq(array){\r\n    array.sort();\r\n    var temp=[array[0]];\r\n    for(var i = 1; i < array.length; i++){\r\n        if( array[i] !== temp[temp.length-1]){\r\n            temp.push(array[i]);\r\n        }\r\n    }\r\n    return temp;\r\n}\r\n\r\nvar aa = [1,2,\"2\",4,9,\"a\",\"a\",2,3,5,6,5];\r\nconsole.log(uniq(aa));<\/pre>\n
\u56db\u3001\u6570\u7ec4\u4e0b\u6807\u6cd5<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t
\n<\/span><\/span>\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
\/*\r\n*\r\n* \u8fd8\u662f\u5f97\u8c03\u7528\u201cindexOf\u201d\u6027\u80fd\u8ddf\u65b9\u6cd51\u5dee\u4e0d\u591a\uff0c\r\n* \u5b9e\u73b0\u601d\u8def\uff1a\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\u3002\r\n* *\/\r\nfunction uniq(array){\r\n    var temp = [];\r\n    for(var i = 0; i < array.length; i++) {\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\u662fi\uff0c\u624d\u5b58\u5165\u6570\u7ec4\uff1b\u5426\u5219\u4ee3\u8868\u662f\u91cd\u590d\u7684\r\n        if(array.indexOf(array[i]) == i){\r\n            temp.push(array[i])\r\n        }\r\n    }\r\n    return temp;\r\n}\r\n\r\nvar aa = [1,2,\"2\",4,9,\"a\",\"a\",2,3,5,6,5];\r\nconsole.log(uniq(aa));<\/pre>\n
\u4e94\u3001\u4f18\u5316\u904d\u5386\u6570\u7ec4\u6cd5<\/span> <\/p>\n
\n\t\n<\/p>\n
\/\/ \u601d\u8def\uff1a\u83b7\u53d6\u6ca1\u91cd\u590d\u7684\u6700\u53f3\u4e00\u503c\u653e\u5165\u65b0\u6570\u7ec4\r\n\/*\r\n* \u63a8\u8350\u7684\u65b9\u6cd5\r\n*\r\n* \u65b9\u6cd5\u7684\u5b9e\u73b0\u4ee3\u7801\u76f8\u5f53\u9177\u70ab\uff0c\r\n* \u5b9e\u73b0\u601d\u8def\uff1a\u83b7\u53d6\u6ca1\u91cd\u590d\u7684\u6700\u53f3\u4e00\u503c\u653e\u5165\u65b0\u6570\u7ec4\u3002\r\n* \uff08\u68c0\u6d4b\u5230\u6709\u91cd\u590d\u503c\u65f6\u7ec8\u6b62\u5f53\u524d\u5faa\u73af\u540c\u65f6\u8fdb\u5165\u9876\u5c42\u5faa\u73af\u7684\u4e0b\u4e00\u8f6e\u5224\u65ad\uff09*\/\r\nfunction uniq(array){\r\n    var temp = [];\r\n    var index = [];\r\n    var l = array.length;\r\n    for(var i = 0; i < l; i++) {\r\n        for(var j = i + 1; j < l; j++){\r\n            if (array[i] === array[j]){\r\n                i++;\r\n                j = i;\r\n            }\r\n        }\r\n        temp.push(array[i]);\r\n        index.push(i);\r\n    }\r\n    console.log(index);\r\n    return temp;\r\n}\r\n\r\nvar aa = [1,2,2,3,5,3,6,5];\r\nconsole.log(uniq(aa));<\/pre>\n
\u516d\u3001\u5229\u7528ES6  Set\u53bb\u91cd<\/p>\n
\n\t\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
let arr = [4, 1, 3, 3, 2, '2'];\r\nlet uniqueArr = [...new Set(arr)];\r\nconsole.log(uniqueArr); \/\/ [4, 1, 3, 2, \"2\"]<\/pre>\n
\n\t\u4e03\u3001\u4f7f\u7528javascript \u7684splice()\u65b9\u6cd5\u4e3a\u6570\u7ec4\u53bb\u91cd\n<\/p>\n
\n\t\n<\/p>\n
function arrDistinct(arr){\r\n        arr.forEach(function(val,index){\r\n            var current=index;\r\n            var j=current+1;\r\n            for( j; j<arr.length;j++){\r\n                if(arr[current]===arr[j]){\r\n                    arr.splice(j,1);\r\n                }\r\n            }\r\n        });\r\n    }<\/pre>\n
\u516b\u3001\u5229\u7528includes<\/p>\n
\n\t\n<\/p>\n
\n\t\n<\/p>\n
function unique(arr) {\r\n    if (!Array.isArray(arr)) {\r\n        console.log('type error!')\r\n        return\r\n    }\r\n    var array =[];\r\n    for(var i = 0; i < arr.length; i++) {\r\n            if( !array.includes( arr[i]) ) {\/\/includes \u68c0\u6d4b\u6570\u7ec4\u662f\u5426\u6709\u67d0\u4e2a\u503c\r\n                    array.push(arr[i]);\r\n              }\r\n    }\r\n    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\n    console.log(unique(arr))\r\n    \/\/[1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]     \/\/{}\u6ca1\u6709\u53bb\u91cd<\/pre>\n
\u4e5d\u3001\u5229\u7528hasOwnProperty<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t <\/span>\n<\/p>\n
function unique(arr) {\r\n    var obj = {};\r\n    return arr.filter(function(item, index, arr){\r\n        return obj.hasOwnProperty(typeof item + item) ? false : (obj[typeof item + item] = true)\r\n    })\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',{},{}];\r\n        console.log(unique(arr))\r\n\/\/[1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {\u2026}]   \/\/\u6240\u6709\u7684\u90fd\u53bb\u91cd\u4e86\r\n\u5229\u7528hasOwnProperty \u5224\u65ad\u662f\u5426\u5b58\u5728\u5bf9\u8c61\u5c5e\u6027<\/pre>\n
\u5341\u3001\u5229\u7528\u5229\u7528filter<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t
\n<\/span><\/span>\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
function unique(arr) {\r\n  return arr.filter(function(item, index, arr) {\r\n    \/\/\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    return arr.indexOf(item, 0) === index;\r\n  });\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',{},{}];\r\n        console.log(unique(arr))\r\n\/\/[1, \"true\", true, 15, false, undefined, null, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]<\/pre>\n
\u5341\u4e00\u3001\u5229\u7528\u9012\u5f52\u53bb\u91cd<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
function unique(arr) {\r\n        var array= arr;\r\n        var len = array.length;\r\n\r\n    array.sort(function(a,b){   \/\/\u6392\u5e8f\u540e\u66f4\u52a0\u65b9\u4fbf\u53bb\u91cd\r\n        return a - b;\r\n    })\r\n\r\n    function loop(index){\r\n        if(index >= 1){\r\n            if(array[index] === array[index-1]){\r\n                array.splice(index,1);\r\n            }\r\n            loop(index - 1);    \/\/\u9012\u5f52loop\uff0c\u7136\u540e\u6570\u7ec4\u53bb\u91cd\r\n        }\r\n    }\r\n    loop(len-1);\r\n    return array;\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',{},{}];\r\nconsole.log(unique(arr))\r\n\/\/[1, \"a\", \"true\", true, 15, false, 1, {\u2026}, null, NaN, NaN, \"NaN\", 0, \"a\", {\u2026}, undefined]<\/pre>\n
\u5341\u4e8c\u3001\u5229\u7528Map\u6570\u636e\u7ed3\u6784\u53bb\u91cd<\/span> <\/p>\n
\n\t\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
function arrayNonRepeatfy(arr) {\r\n  let map = new Map();\r\n  let array = new Array();  \/\/ \u6570\u7ec4\u7528\u4e8e\u8fd4\u56de\u7ed3\u679c\r\n  for (let i = 0; i < arr.length; i++) {\r\n    if(map .has(arr[i])) {  \/\/ \u5982\u679c\u6709\u8be5key\u503c\r\n      map .set(arr[i], true); \r\n    } else { \r\n      map .set(arr[i], false);   \/\/ \u5982\u679c\u6ca1\u6709\u8be5key\u503c\r\n      array .push(arr[i]);\r\n    }\r\n  } \r\n  return array ;\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',{},{}];\r\n    console.log(unique(arr))\r\n\/\/[1, \"a\", \"true\", true, 15, false, 1, {\u2026}, null, NaN, NaN, \"NaN\", 0, \"a\", {\u2026}, undefined]\r\n\u521b\u5efa\u4e00\u4e2a\u7a7aMap\u6570\u636e\u7ed3\u6784\uff0c\u904d\u5386\u9700\u8981\u53bb\u91cd\u7684\u6570\u7ec4\uff0c\u628a\u6570\u7ec4\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u4f5c\u4e3akey\u5b58\u5230Map\u4e2d\u3002\u7531\u4e8eMap\u4e2d\u4e0d\u4f1a\u51fa\u73b0\u76f8\u540c\u7684key\u503c\uff0c\u6240\u4ee5\u6700\u7ec8\u5f97\u5230\u7684\u5c31\u662f\u53bb\u91cd\u540e\u7684\u7ed3\u679c\u3002<\/pre>\n
\u5341\u4e09\u3001\u5229\u7528reduce+includes<\/span><\/p>\n
\n\t\n<\/p>\n
\n\t <\/span><\/span>\n<\/p>\n
function unique(arr){\r\n    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}]<\/pre>\n
\n\t\n<\/p>\n
\n\t\u5341\u56db\u3001hash\u6cd5\n<\/p>\n
function unique3(arr){\r\n    for (var i =0,hash=[];i<arr.length ;i++ ){\r\n        if (hash[arr[i]]==undefined){\r\n        hash[arr[i]]=1;\r\n        } \r\n    }\r\n    var j=0;\r\n    var keys=[];\r\n    for (keys[i++] in hash );\r\n    return keys;\r\n}\r\nconsole.log( unique3(arr) );\r\n<\/pre>\n<\/p>\n
\n\t\n<\/p>\n
\"~d\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001\u7b80\u5355\u7684\u53bb\u91cd\u65b9\u6cd5 \/\/ \u6700\u7b80\u5355\u6570\u7ec4\u53bb\u91cd\u6cd5 \/* * \u65b0\u5efa\u4e00\u65b0\u6570\u7ec4\uff0c\u904d\u5386\u4f20\u5165\u6570\u7ec4\uff0c\u503c\u4e0d\u5728\u65b0\u6570\u7ec4\u5c31push\u8fdb\u8be5\u65b0…<\/p>\n","protected":false},"author":2,"featured_media":3107,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[38],"tags":[],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/3101"}],"collection":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/comments?post=3101"}],"version-history":[{"count":8,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/3101\/revisions"}],"predecessor-version":[{"id":3119,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/3101\/revisions\/3119"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media\/3107"}],"wp:attachment":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media?parent=3101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=3101"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=3101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}