javascript - 如何在JS中动态获取const值

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如何动态获得类似于PHP中constant()的常量值？

在下面，我想访问HELL_NO，但是在变量中有NO。为什么返回undefined？

const HELL_YES='warm';
const HELL_NO='cool';
var pick='NO';
console.log(window['HELL_'+pick]);

最佳答案

您可以使用eval：

const HELL_YES='warm';
const HELL_NO='cool';
var pick='NO';
console.log(eval("HELL_" + pick));

编辑

因为eval是evil，所以应该改用一个对象：

const obj = {
  HELL_YES: "warm",
  HELL_NO: "cool"
};

console.log(obj["HELL_" + "YES"]);