对象变量

function Person(age){
    var name = "Lala"; //私有变量
        this.age = age; //公有变量
    this.getName = function(){  //公有函数
        return name;
    }
}

var p1 = new Person("Ho");
document.writeln(p1.getName()); // Lala
document.writeln(p1.name); //undefin