js如何获取变量名

let myVariable = 'Hello, World!';
console.log('myVariable'); // 输出: myVariable

let globalVariables = {};
globalVariables.var1 = 'value1';
globalVariables.var2 = 'value2';

console.log(Object.keys(globalVariables)); // 输出: ['var1', 'var2']

var globalVar1 = 'global1';
var globalVar2 = 'global2';

console.log(Object.keys(window)); // 输出: ['globalVar1', 'globalVar2', ...] // 还会包含其他由浏览器创建的全局变量

let varName = 'myVariable';
let myVariable = 'Hello, World!';
console.log(varName); // 输出: myVariable
console.log(eval(varName)); // 输出: Hello, World! 注意：使用eval通常是不推荐的，因为它可能导致安全问题和性能问题。

let variables = {};
variables.myVariable = 'Hello, World!';
console.log(variables.myVariable); // 输出: Hello, World!