<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="application/javascript">
var x=1;
function pi(){
this.x=2;return x;
}
var a=new pi();
alert(a.x);
</script>
</head>
<body>
</body>
</html>
答案: 2
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