在 JavaScript 中将字符串转换为变量名

问题描述

我一直在寻找解决方案，但找不到任何有效的方法.

I’ve looked for solutions, but couldn’t find any that work.

我有一个名为 onlyVideo 的变量.

I have a variable called onlyVideo.

"onlyVideo" 字符串被传递到一个函数中.我想将函数内的变量 onlyVideo 设置为某物.我该怎么做?

"onlyVideo" the string gets passed into a function. I want to set the variable onlyVideo inside the function as something. How can I do that?

(有许多变量可以被调用到函数中，所以我需要它动态工作，而不是硬编码的 if 语句.)

(There are a number of variables that could be called into the function, so I need it to work dynamically, not hard coded if statements.)

可能有更好的方法来做您正在尝试做的事情.我在 JavaScript 冒险的早期就问过这个问题.查看 JavaScript 对象的工作原理.

简单介绍:

// create JavaScript object
var obj = { "key1": 1 };

// assign - set "key2" to 2
obj.key2 = 2;

// read values
obj.key1 === 1;
obj.key2 === 2;

// read values with a string, same result as above
// but works with special characters and spaces
// and of course variables
obj["key1"] === 1;
obj["key2"] === 2;

// read with a variable
var key1Str = "key1";
obj[key1Str] === 1;

推荐答案

如果是全局变量则 window[variableName]或者在您的情况下 window["onlyVideo"] 应该可以解决问题.

If it's a global variable then window[variableName]or in your case window["onlyVideo"] should do the trick.

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