js删除array

/*
*  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.
* splice方法见http://www.w3school.com.cn/js/jsref_slice_array.asp
*/



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);
</script>