var Class = function (parent) {
var klass = function () {
this.init.apply(this, arguments);
}
if (parent) {
/**
* 所有的子类都共享了同一个原型
* 避免在继承类的时候创建实例,只有实例的属性才会被继承
* 而非类的属性,设置对象的__proto__
* **/
var ctor = function () {
};
ctor.prototype = parent.prototype;
klass.prototype = new ctor;
}
klass.prototype.init = function () {
}
//prototype别名
klass.fn = klass.prototype;
//定义类的别名
klass.fn.parent = klass;
klass.__super__ = klass.__proto__;
//给类添加属性
klass.extend = function (obj) {
var extended = obj.extended;
for (var i in obj) {
klass[i] = obj[i];
}
if (extended) extended(klass);
}
//给实列添加属性
klass.include = function (obj) {
var included = obj.included;
for (var i in obj) {
klass.fn[i] = obj[i];
}
//触发回调
if (included) included(klass);
}
return klass;
}
var Animal = new Class;
Animal.include({
breath:function () {
console.log("breath")
}
})
var Cat = new Class(Animal)
var tommy = new Cat;
console.log(tommy)