javascript 获取数组元素最大值的索引值。

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(function(){  
            var arr = new Array(1,7,0,4,3,10);  
            Array.prototype.max = function() {     
             var max = this[0];   
             var len = this.length;    
             for (var i = 1; i < len; i++){  
               this.index = i;  
               if (this[i] > max) {         
               max = this[i ];   
               num = this.index;  
              }    
             }      
             return num;   
            }  
             alert(arr.max());  
        })()