简单的JS多重继承示例

Class=function(){
varbase={};
for(vark=0;k//{{newarguments[k]()withcustomconstructorfield.
varo=arguments[k].prototype;
o.constructor=arguments[k];
arguments[k].call(o);
//}}
for(keyino)base[key]=o[key];
}
functionKlass(){
//foreveryclassoneobjectcache.
varclso=null;
functionklass(){
if(arguments.length<=0&&clso!=null){
//hitcache.
returnclso;
}
if($defined(this.constructor.init)){
//useinit()forclassinitialization.
this.constructor.init.apply(this,arguments);
}
clso=this;
}
klass.prototype=base;
returnklass;
}
returnKlass();
}

A=newClass();
A.init=function(){
this.x=400;
this.y=300;
}
B=newClass(A);
B.init=function(){
this.y=200;
this.z=100;
}
C=newClass(B);
C.init=function(){
this.z=0;
}
c=newC();
alert(c.x);
alert(c.y);
alert(c.z);