无法通过javascript中的特权方法访问私有方法

Question

错误：在尝试打印年龄函数时控制台中出现未定义错误

var Person = function( myName, myProfession, myage ){
        this.name = myName;  // Public Variable 
        this.profession = myProfession;
        var age = myage;  // Private Variable 
        this.myAge = function(){  // Privilaged Method
            return this.age;
        };
        };
      var syed = new Person('syed azam','developer',20);
      console.log(syed + "works fine");
      console.log(syed.myAge());

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>

Answer 1

什么是this.age？您没有正确封装它：

this.myAge = function(){
    return myage;
};

请注意，您不必使用var age = myage;。的 DEMO.