function defineSubclass(superclass,
//父类的构造函数
constructor,
//新的子类的构造函数
methods,
//实例方法：复制至原型中
statics)
//类属性：复制至构造函数中
{
//建立子类的原型对象
constructor.prototype =
inherit(superclass.prototype);
constructor.prototype.constructor =
constructor;
//像对常规类一样复制方法和类属性
if(methods) extend(constructor.prototype,methods);
if(statics) extend(constructor,statics);
return constructor;
}
function inherit(p)
{
if(!p){
throw TypeError();}
if(Object.create){Object.create(p);}
var t =
typeof p;
if(t !== "object" && t !== "function"
)
{
throw TypeError();
}
function f(){};
f.prototype =
p;
return new f();
}
function extend(proto,methods)
{
proto[methods] =
methods();
return proto;
}
function Person(name,age){
this.name =
name;
this.age =
age;
}
Person.prototype.eat =
function(){alert("eat!"
);}
function Student(){}
defineSubclass(Person,Student,function learn(){alert("learn!");})
//通过父类构造函数的方法来做到这一点
Function.prototype.extend =
function(constructor,methods,statics)
{
return defineSubclass(
this,constructor,methods,statics);
}
转载于:https://www.cnblogs.com/zjtTT/p/5055616.html
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