<script type="text/javascript">
function A(){
this.B=function(){ return 20;
}
} function C(){
var D = new A();
alert(D.B());
}
</script>
1 回答
![?](http://img1.sycdn.imooc.com/5333a1a90001c8d802000200-100-100.jpg)
慕的地10843
TA贡献1785条经验 获得超8个赞
因为你没执行......
function A(){ this.B=function(){ return 20; } } function C(){ var D = new A(); alert(D.B()); } C();
或者
function A(){ this.B=function(){ return 20; } } +(function C(){ var D = new A(); alert(D.B()); })();
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