将变量与嵌套Javascript对象一起使用 [英] Using variables with nested Javascript object

问题描述

假设我有这个:

var a = { A : { AA : 1 }, B : 2 };

我是否可以创建一个变量，使我可以引用AA或B?语法是什么样的?

Is there a way for me to create a variable that could allow me to reference either AA or B? What would the syntax look like?

// I know I can do this:    
a['B']; // 2
a['A']['AA']; // 1

// something like this?
var myRef = ???;
a[myRef]; 1 or 2 depending on myRef

如果没有，那么在这里得到我想要的东西的更好的方法是什么?

If not, what's a better way to get what I'm going for here?

推荐答案

不直接.

平对象，具有新对象 var a = {'A.AA':1;B:2}; .

请参见在JavaScript中压缩对象层次结构或将复杂的json对象平铺以进行mvc绑定以获取的javascript函数.

See compressing object hierarchies in JavaScript or Flattening a complex json object for mvc binding to get the javascript function for it.

我看到Eugen已经解决了它.重新发布了经过代码审查的版本:

I can see it was already addressed by Eugen. Reposted code-reviewed version:

function Leaf(obj,path) {
  path=path.split('.');
  var res=obj;
  for (var i=0;i<path.length;i++) res=res[path[i]];
  return res;
}

解决方案3-使用eval

var x = eval("a." + myRef); // x will be 1 for myRef == "A.AA", 2 for "B"

请谨慎使用此解决方案，因为您可能会引入一些安全问题.这更多的是好奇心.

Be careful with this solution as you may introduce some security issues. It is more of the curiosity.

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