学步园

<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>