javascript通过位运算完成两个数的交换

<script type="text/javascript">
//位运算法
function swap(a,b) {
a = a^b;
b = a^b;
a = a^b;
return [a,b];
}
alert(swap(5,9));
//加减法
function swap(a,b) {
a = a-b;
b = a+b;
a = b-a;
return [a,b];
}
alert(swap(3,4));
</script>