<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>07_面试题2</title>
</head>
<body>
<script type="text/javascript">
function fun(n,o) {
console.log(o)
return {
fun:function(m){
return fun(m,n)
}
}
}
var a = fun(0)
a.fun(1)
a.fun(2)
a.fun(3)//undefined,0,0,0
var b = fun(0).fun(1).fun(2).fun(3)//undefined,0,1,2
var c = fun(0).fun(1)
c.fun(2)
c.fun(3)//undefined,0,1,1
</script>
</body>
</html>
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