JavaScript中是否可以使用字符串格式的名称来调用在另一个函数范围内声明的函数？

Question

Please tell if the below would be possible without making function fun a method of an object.

(function a() {
var fun = function() {
console.log('abc');
}
var x = 'fun';
// call fun using x (How ?)
})();

Answer 1

You could use eval . This will evaluate the string as JavaScript code.

 (function a() { var fun = function() { console.log('abc'); } var x = 'fun'; eval(x)(); })(); 

Answer 2

I always prefer to use window variable to execute my function instead of using eval, also I remember that some browsers throws warnings when you use eval. Also at chrome extensions is not enabled by default.

So in my case, you can set a function into windows global variable like this:

windows.x = function(){
    // do something here
}

and then execute it like this:

windows["x"]()