利用javascript的运算符将两个数值交换

<script type="text/javascript">var num1=10;var num2=20;var num3;num3=num1;//num3=10 num1=10num1=num2;//num1=20 num=20num2=num3;//num2=10console.log('num1='+num1);console.log('num2='+num2);</script>