javascript - javascript闭包:保护内部变量

我正在使用显示模块模式，如下所示：

var SomeClosure = function () {

  var SomeInnerVar = 4;

  function InnerGetTheVar() {
     return SomeInnerVar;
  }

  function InitClosure() {
       // there's something else happening here that requires me to
       // wait for document.ready before initializing the closure
       setInterval(IncreaseSomeInnerVar, 10000);
  }

  function IncreaseSomeInnerVar() {
     SomeInnerVar = SomeInnerVar  + 1;
  }

  InitClosure();

  return  {
     GetTheVar: InnerGetTheVar
  }
}

$(document).ready(function () {

   SomeClosure = SomeClosure();
});

现在为什么要在控制台中键入以下内容：

SomeClosure.GetTheVar = 2;
SomeClosure.GetTheVar; // outputs 2!

为什么闭包不保护SomeInnerVar？我不希望外部范围能够像这样更改SomeInnerVar。

感谢您的建议。

最佳答案

使用Object.defineProperty而不是仅返回对象文字：

var out = {};

if ( Object.defineProperty ) {
    Object.defineProperty(out, 'GetTheVar', {
        value: InnerGetTheVar,
        writable: false
    });
} else {
    out.GetTheVar = InnerGetTheVar;
}

return out;

关于javascript - javascript闭包:保护内部变量，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12135017/