是否可以用JavaScript编写连续的嵌套函数?

问题描述

我知道这是闭包的领域，而不是闭包的领域.但是可以连续调用嵌套的匿名函数吗?

I know this is the realm of closures and what not. But is it possible to continuously call nested anonymouse funtions?

说我有这个:

function testing(input) {

  var testing = 0;
  (function() {
    testing = testing + 1;
  })()

  return "testing";
}

我们可以有这样的东西testing()()()()()()()吗?

Can we have something like this testing()()()()()()() ?

推荐答案

您可以使用内部函数进行更新，并具有toString方法来获取原始值.

You could use an inner function which makes the update and has a toString method to get a primitive value.

function testing() {
    function fn() {
        string += ++counter;
        return fn;
    }

    var counter = 0,
        string = 'foo';

    fn.toString = _ => string;
    return fn();
}

console.log(testing());
console.log(testing()());
console.log(testing()()());

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