数组去重复是js中常用的方法，归纳了四种如下：

1. for + indexOf  去重复

  1. 1       var arr = [3,5,5,4,1,1,2,3,7,2,5];
  2. 2       var target = [];
  3. 3       for(var i=0,len=arr.length;i<len;i++){
  4. 4         if( target.indexOf(arr[i])==-1 ){
  5. 5           target.push(arr[i]);
  6. 6         }
  7. 7       };
  8. 8       console.log(target);

2. forEach + indexOf 去重复

  1. 1       var arr = [3,5,5,4,1,1,2,3,7,2,5];
  2. 2       var target = [];
  3. 3       arr.forEach(function(val){
  4. 4         if(this.indexOf(val)==-1){
  5. 5           this.push(val);
  6. 6         };
  7. 7       },target);
  8. 8       console.log(target);

3.原型对象 prototype + for + indexOf 去重复

  1.  1       Array.prototype.quchong = function(){
  2.  2         var target = [] ;
  3.  3         for(var i=0,len=this.length;i<len;i++){
  4.  4           if(target.indexOf(this[i])==-1){
  5.  5             target.push(this[i]);
  6.  6           }
  7.  7         };
  8.  8         return target;
  9.  9       };
  10. 10       var arr = [3,5,5,4,1,1,2,3,7,2,5];
  11. 11       console.log(arr.quchong());

4.原型对象 prototype + forEach + indexOf 去重复

  1.  1       Array.prototype.quchong = function(){
  2.  2         var target = [];
  3.  3         this.forEach(function(val){
  4.  4           if(this.indexOf(val)==-1){
  5.  5             this.push(val);
  6.  6           }
  7.  7         },target);
  8.  8         return target;
  9.  9       };
  10. 10       var arr = [3,5,5,4,1,1,2,3,7,2,5];
  11. 11       console.log(arr.quchong());

运行结果：

 

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