JScript code:
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
谁能帮我解释哈
JScript code:
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);
[Quote=引用 1 楼 zhq_442577358 的回复:]
JScript code:
function C1(){}
function C2(){}
C2.prototype=new C1();
function C3(){}
C3.prototype=new C2();
function C4(){}
C4.prototype=new C3();
C2.prototype=new C4();
var obj=new C3();
alert(obj instanceof C2)
问题内容：判断顺序号列及子序号列必须为数字。
<td><div align="center"><input type="text" name="xuHao${g+1}" class="inputW" value="& ......
