<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
var arr = [1,2,3,4,5,6,7,8];
for(var i = 0;i<arr.length/2;i++){
//arr[0] arr[arr.length-1-0];
//arr[1] arr[arr.length-1-1];
//arr[2] arr[arr.length-1-2];
//arr[3] arr[arr.length-1-3];
//借助第三方变量交换两个变量的值
var temp = arr[i];
arr[i] = arr[arr.length-1-i];
arr[arr.length-1-i] = temp;
}
console.log(arr);
</script>
</body>
</html>
运行结果
