<html>
<head>
<script type="text/javascript">
function swap(a, b) {
var c;
c = a;
a = b;
b = c;
}
var a = [1,2];
alert(a[1]);
swap(a[0],a[1]);
alert(a[0]);
alert(a[1])
</script>
</head>
<body>
</body>
</html>
提示说的是 好像ab没定义?
然后下面这个报错事什么意思?