javascript - 尝试使用 IIFE 时未捕获类型错误

Question

我是 JavaScript 新手，我正在尝试理解函数的逻辑。这是我尝试做的事情:

var GetterSetter = (function () {
    var balance = 0.0;


    var getBalance = function () {
        return balance;
    };
    var setBalance = function (amount) {
        if (amount > 0) {
           return balance = amount;
        }
      };
})();

GetterSetter.setBalance(120);

当我尝试运行它时。我得到:

Uncaught TypeError: Cannot read property 'setBalance' of undefined at GetterSetterScript.js:16

Answer 1

使用

return {
    getBalance:getBalance,
    setBalance:setBalance
}

在函数末尾