错哪了，求助！

[sqlaqandy]

<script defer>

function A(o)
{
B(o);
}

function B(o)
{
this.data = o;
}

function C(n)
{
this.name = n;
}

var a = new A(new C("dsf"));
alert(a.data.name);
</script>

[hbhbhbhbhb1021]

<script defer>

function A(o)
{
var x=new B(o)
return x;
}

function B(o)
{
this.data = o;
}

function C(n)
{
this.name = n;
}

var a = new A(new C("dsf"));
alert(a.data.name);
</script>

[Dogfish]

<script defer>

function A(o)
{
this.obj=new B(o);
}

function B(o)
{
this.data = o;
}

function C(n)
{
this.name=n;
}

var a = new A(new C("dsf"));
alert(a.obj.data.name);
</script>

[GaoXX]

顶一下