A JS code that randomly takes an x without repeating data from an array

Source: Internet
Author: User
Tags rand hasownproperty

  This article mainly introduces the random x data from the array of the JS code, the need for friends can refer to the

Some operations on the array are frequently encountered in the work     1. Random x data from the data (PS: The following s.each is the Kissy.each method, you can change to a for loop)   code as follows:/* random x from the array arr of data not duplicated  */ function Myrand (arr,num) {    var newArr = [];     rand (num);    //random x       FUNCTI On rand (k) {        if (k==0) {            return;       & nbsp }         var index = Math.floor (Math.random () * arr.length);         var flag = true;         S.each (newarr,function (v) {            if (v = = Arr[index]) {&nbs P               flag = false;            }        }         if (flag) {            Newarr.push (Arr[index])     &NB Sp       k--;        }        Rand (k);    }     return NEWARR; &NBSP}       2. Random x data from object     code as follows:/* Randomly take x  */function Myrand () {  &nbsp from Object obj ; var S = Kissy;     var obj={     : {name: ' A '},       ': {name: ' B '},   & nbsp     ': {name: ' C '},         ': {name: ' d '},       ': {name: ' E '}, & nbsp       ' a ': {name: ' F '},       '   ': {name: ' G '},       ': {name: ' H '},         ': {name: ' I '},       ': {name: ' G '}    };     var arr = [];     S.each (obj,function (v,k) {        Arr.push (k);    });    //randomly take 3     var newArr = Myrand (arr,3);     S.each (newarr,function (b) {        Console.log (obj[b]);    })};     3. Remove duplicates of array   code as follows:/* Remove duplicate of array  */function Uniqarr (arr) {    function toobject (a) {    &nbs P   var o = {};         for (Var i=0, j=a.length i<j; i=i+1) {          O[a[i]] = True        }         return o;    };     function keys (o) {        var a=[], I;         (i in O) {&nbsp ;           if (O.hasownproperty (i)) {//Here, Yui Source is Lang.hasownproperty (o, i)                 A.push (i);             {       }         return A;    };     Return keys (Toobject (arr)); }
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