为什么在JavaScript父变量中取得子变量的值？

Question

请帮我解决下一个问题。

var a = _b; //_b and _c is arguments. _b is array of objects (length = 1), _c is integer value 
if (a.length != 0) 
{ 
    $.each(a,function(k,v){ 
    if (v.c!= _c) 
     a.splice(k,1);//here a becomes empty, but _b becomes empty too. i don't know why. 
    }); 
    if (a.length != 0){ 
     _b = a; 
    } 
} 

我究竟做错了什么？

Answer 1

可变a是到阵列_b，不是复制的引用，所以排空a清空_b太。