JavaScript 改变列表项的顺序

​x
 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
​
<ul id="myList"><li>Coffee</li><li>Tea</li><li>Water</li><li>Milk</li></ul>
​
<p id="demo">单击该按钮改变列表项的顺序</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
    var list=document.getElementById("myList");
    var node=list.getElementsByTagName("li");
    list.insertBefore(node[3],node[1]);
}
</script>
​
</body>
</html>
HTML