<!doctype html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<meta charset="UTF-8"/>
<title>Document</title>
</head>
<body>
<script>
var test=(function(a){
this.a=a;
return function(b){
return this.a+b;
}
}(function(a,b){
return a;
debugger;
}(1,2)));
console.log(test(4))
//结果是输出5 求解?
</script>
</body>
</html>
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