Javascript根据指定下标或对象删除数组元素

/** 
*删除数组指定下标或指定对象 
*/ 
Array.prototype.remove=function(obj){ 
for(var i =0;i <this.length;i++){ 
var temp = this[i]; 
if(!isNaN(obj)){ 
temp=i; 
} 
if(temp == obj){ 
for(var j = i;j <this.length;j++){ 
this[j]=this[j+1]; 
} 
this.length = this.length-1; 
} 
} 
}

var arr =new Array(); 
arr[0]="dddddd"; 
arr[1]="dxxxxxxx"; 
arr[2]="vvvvvvv"; 
arr[3]="dbbbbb"; 
var str ="vvvvvvv"; 
arr.remove(3);//删除下标为3的对象 
arr.remove(str);//删除对象值为“vvvvvvv”