function C1(){}
function C2(){}
C2.prototype=new C1();
function C3(){}
C3.prototype=new C2();
var obj=new C3();
function C4(){}
C3.prototype=new C4();
alert(obj instanceof C2);//true alert(obj instanceof C1);//true alert(obj instanceof C3);//false
alert(obj instanceof C4);//false 这个是为什么啊
function C1(){}
function C2(){}
C2.prototype=new C1();
function C3(){}
C3.prototype=new C2();
var obj=new C3();
function C4(){}
C3.prototype=new C4();
var obj1 = new C3();
alert(obj instanceof C2);//true alert(obj instanceof C1);//true alert(obj instanceof C3);//false
alert(obj instanceof C4);//false 这个是为什么啊
alert(obj1 instanceof C2);
alert(obj1 instanceof C4);
function color(){}; //define color
function colRed(){}; //define red colorcolor.prototype = new colRed(); //再次让color继承colRed
var objRed1 = new color(); //第一次继承colRed的对象
color.prototype = new colRed();//再次让color继承colRed
var objRed2 = new color(); //第二次继承colRed的对象alert(objRed1 instanceof color); //false 这个为什么
alert(objRed2 instanceof color); //true