js删除Array数组中指定元素的两种方法

/* 
* 方法:Array.remove(dx) 通过遍历,重构数组 
* 功能:删除数组元素. 
* 参数:dx删除元素的下标. 
*/ 
Array.prototype.remove=function(dx) 
{ 
  if(isNaN(dx)||dx>this.length){return false;} 
  for(var i=0,n=0;i<this.length;i++) 
  { 
    if(this[i]!=this[dx]) 
    { 
      this[n++]=this[i] 
    } 
  } 
  this.length-=1 
} 
a = ['1','2','3','4','5']; 
alert("elements: "+a+"\nLength: "+a.length); 
a.remove(1); //删除下标为1的元素 
alert("elements: "+a+"\nLength: "+a.length);

/* 
* 方法:Array.baoremove(dx) 
* 功能:删除数组元素. 
* 参数:dx删除元素的下标. 
* 返回:在原数组上修改数组. 
*/ 
Array.prototype.baoremove = function(dx) 
{ 
  if(isNaN(dx)||dx>this.length){return false;} 
  this.splice(dx,1); 
} 
b = ['1','2','3','4','5']; 
alert("elements: "+b+"\nLength: "+b.length); 
b.baoremove(1); //删除下标为1的元素 
alert("elements: "+b+"\nLength: "+b.length);