js 笔记

var Class = { //这是prototype 里的书法,用来生成一个空的构造函数。
        create: function() {
                return function() {
                        this.init.apply(this, arguments);
                }
        }
}
Object.extend = function(destination, source) { //扩民对象
        for (var property in source) {
                destination[property] = source[property];
        }
        return destination;
}
var person = Class.create();
Object.extend(person.prototype, { //给person添加公共方法
        init: function(name) {
                this.name = name;
        },
        getName: function() {
                return this.name;
        },
        setName: function(newName) {
                this.name = newName;
        },
        setAge: function(newage) {
                this.age = newage;
        }
});
var user = Class.create(); //创建user
user.prototype = Object.extend(new person(), { //扩展person的一个实例，并返回给user.prototype
        init: function(name, age) {
                this.name = name;
                this.age = age;
        },
        getName: function() {
                return 'my name is : ' + this.name;
        },
        getAge: function() {
                return this.age;
        }
}); 

//这样一来，user的实例将会有上面所有的方法了。
var test = new user();
test.init('zjh', 28);
test.setName('sky');
alert(test.getName());
alert(test.getAge());
test.setAge(18);
alert(test.getAge());