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 = [&#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;5&#39;];
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);