javascript - 我的关闭错误

Question

JS Bin example

为什么不算，我在控制台输出一直是1。我是闭包新手，我一定错过了一些简单的东西？这是 jsbin 中的代码:

var counterFunc = function()
{
  var count = 0;

  var incCount = function()
  {
    count = count + 1;
    return count;
  };

  return incCount();
};

var myCounter = counterFunc;
console.log(myCounter());
console.log(myCounter());

Answer 1

通过从 counterFunc 返回 incCount()(调用结果)，您并没有真正创建闭包函数。您想要返回一个函数，并调用 counterFunc() 来创建它:

var counterFunc = function() {
  var count = 0;

  var incCount = function() {
    count = count + 1;
    return count;
  };

  return incCount ;
//               ^
};

var myCounter = counterFunc();
//                         ^^
console.log(myCounter());
console.log(myCounter());