/*申明2個構(gòu)造器*/
var flower=function(){
this.name="nokia";
}
var flower2=function(){
this.age=22;
}
/*原型鏈*/
flower2.prototype=new flower();
/*根據(jù)剛才原型的定義,實例obj必然復(fù)制自new flower();*/
obj=new flowe2();
/*從父類繼承的屬性*/
alert(obj.name); //==>"nokia"
alert(obj.age); //==>22

function flower(){}
function flower2(){}
flower2.prototype=new flower();
var obj1=new flower();
var obj2=new flower2();
/*問題出現(xiàn)了,2個實例的constructor屬性都指向flower*/
alert(obj1.constructor==obj2.constructor);
/*obj1和obj2是不同的構(gòu)造器產(chǎn)生的實例,缺指向相同的構(gòu)造器,顯然出了問題*/

flower2.prototype=new flower();
/*重置原型后,修改原型的constructor屬性*/
flower2.prototype.constructor=flower2
或每次構(gòu)造實例時都重寫constructor屬性
function flower2(){
this.constructor=arguments.callee;
}
flower2.prototype=new flower();

var Class={
create:function()
{
var _class=function()
{
this.init.apply(this,arguments);
}
_class.prototype.init=Function.prototype.init;
try{
return _class;
}finally{
_class=null;
}
}
};
//默認構(gòu)造函數(shù)
Function.prototype.init=function(){}
//方法擴展
Function.prototype.extend=function(list)
{
for(var i in list)this.prototype[i]=list[i];
return this;
}
//多級繼承
Function.prototype.inherits=function(parent)
{
//繼承的深度級別
var _depth=0;
//方法屬性移植
this.extend(new parent());
//初始化構(gòu)造函數(shù) 類的繼承通常不繼承構(gòu)造函數(shù)
this.prototype.init=Function.prototype.init;
//類的靜態(tài)父類
this.parent=parent;
//執(zhí)行父類函數(shù)
this.prototype.parent=function(name)
{
//若沒有參數(shù)則執(zhí)行構(gòu)造函數(shù)
if(!name)name='init';
//即將執(zhí)行的父類
var _parent=parent;
//若當(dāng)前已經(jīng)在父類中執(zhí)行則繼續(xù)向上尋找超類
if(_depth)
{
for(var i=0;i<_depth;i++)
{
_parent=_parent.parent;
}
}
//設(shè)置好級別
_depth++;
try{
//執(zhí)行函數(shù)并返回值
return _parent.prototype[name].apply(this,Array.prototype.slice.apply(arguments,[1]));
}catch(e){
throw(e);
}finally{
//恢復(fù)級別
_depth--;
}
}
return this;
}

//創(chuàng)建名為class1的構(gòu)造器
var class1=Class.create().extend({
b:function()
{
alert('clas');
alert(this.c);
},
c:100
});
//創(chuàng)建"對象"(構(gòu)造器)的實例
var s=new class1();
s.b();// ==>"clas",100

var test=Class.create().inherits(class1).extend({
b:function()
{
alert('test');
this.parent('b')
},
c:110
});