数组去重的方法

 //字符串去重
function quStr(str){
       var arr = str.split(‘‘)
       var temp = {},
             arr1 = [];
       for(var i = 0; i<arr.length;i++){
            if(!temp[arr[i]]){
                  temp[arr[i]] = ‘abc‘;
                  arr1.push(arr[i])
            }
        }
         return arr1;
}
var str1 = quStr(‘absbdbabdbdsbfbabrbadbfgb‘).join(‘‘)
console.log(str1)

var arr = [1,1,1,2,3,3,3,2,2,4,4,4]
Array.prototype.unique=function(){
    var temp = {};
    var arr = [],
          len = this.length;
   for(var i = 0; i< len; i++){
        if(!temp[this[i]]){
             temp[this[i]] = ‘abc‘;
             arr.push(this[i]);
        }
   }
   return arr;
}
arr.unique();