Array string correlation in JS

1. String to Array

var s = "abc,abcd,aaa";
SS = S.split (",");//decomposition at each comma (,).

2. Array to String

var a, B;
A = new Array (0,1,2,3,4);
b = A.join (",");

3. Query whether an array contains an element

var Num=jquery.inarray (value, array);

Explanation: Returns the position of value in the array, starting with a count of 0 (1 if not found).

Remove Duplicates in 4.js

Refer to other people to summarize:

4.1

Array.prototype.unique1 = function() {

     var r = new Array();      label: for ( var i = 0, n = this .length; i < n; i++) {          for ( var x = 0, y = r.length; x < y; x++) {              if (r[x] == this [i]) {                  continue label;              }          }          r[r.length] = this [i];      }      return r; }4.2 Regular Array.prototype.unique2 = function () {      return this .sort().join( ",," ).replace(/(,|^)([^,]+)(,,\2)+(,|$)/g, "$1$2$4" ).replace(/,,+/g, "," ).replace(/,$/, "" ).split( "," ); }4.3 Using the object's "hasOwnProperty" method rray.prototype.unique3 = function () {      var temp = {}, len = this .length;      for ( var i=0; i < len; i++)  {          var tmp = this [i];          if (!temp.hasOwnProperty(tmp)) {              temp[ this [i]] = "my god" ;          }      }        len = 0;      var tempArr=[];      for ( var i in temp) {          tempArr[len++] = i;      }      return tempArr; }4.4 First Order, the preceding paragraph than latter. This method is quite simple, but also practical. Array.prototype.unique4 = function () {      var temp = new Array();        this .sort();        for (i = 0; i < this .length; i++) {            if ( this [i] == this [i+1]) {              continue ;          }            temp[temp.length]= this [i];        }        return temp;   }4.5 High efficiency Array.prototype.unique5 = function () {      var res = [], hash = {};      for ( var i=0, elem; (elem = this [i]) != null ; i++)  {          if (!hash[elem])          {              res.push(elem);              hash[elem] = true ;          }      }      return res; }

Array string correlation in JS