Javascript：将字符串解释为对象引用？ [英] Javascript: interpret string as object reference?

问题描述

可能重复：

Javascript使用变量作为对象名称

如何做我让JS将字符串视为对先前定义的对象的引用？简化：

How do I get JS to treat a string as a reference to a previously defined object? Simplified:

var myObject = new MyObject();

var myString = "myObject";

var wantThisToWork = myString.myproperty;

推荐答案

如果变量在全局范围内，您可以将其作为全局对象的属性访问

If the variable is in the global scope, you can access it as a property of the global object

var a = "hello world";
var varName = "a";
console.log( window[varName] ); // outputs hello world
console.log( this[varName] ); // also works (this === window) in this case

但是，如果它是局部变量，唯一的方法是使用 eval （免责声明）

However, if it's a local variable, the only way is to use eval (disclaimer)

function () {
  var a = "hello world";
  var varName = "a";
  console.log( this[varName] ); // won't work
  console.log( eval(varName) ); // Does work
}

除非你可以将动态变量放入一个对象并访问它就像一个属性

Unless you can put your dynamic variables into an object and access it like a property

function () {
  var scope = {
    a: "hello world";
  };
  var varName = "a";
  console.log( scope[varName] ); // works
}

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