Code <script type="text/javascript"> <!-- //不用第三个变量实现a,b的值交换 var a = 3, b = 5; alert(a); alert(b); //方法1:用异或运算 a = a ^ b; b = a ^ b; a = a ^ b; //方法2:用加减运算 //a = a + b; //b = a - b; //a = a - b; alert(a); alert(b); //--> </script>