JavaScript中appendChild()方法的使用与节点移动详解

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<ul id="myList"><li>Coffee</li><li>Tea</li></ul>
<p id="demo">单击按钮将项目添加到列表中</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	var node=document.createElement("LI");
	var textnode=document.createTextNode("Water");
	node.appendChild(textnode);
	document.getElementById("myList").appendChild(node);
}
</script>
<p><strong>注意:</strong><br>首先创建一个节点，<br> 然后创建一个文本节点，<br>然后将文本节点添加到LI节点上。<br>最后将节点添加到列表中。</p>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <select id="select1" multiple="multiple" size="10">
        <option>左1</option>
        <option>左2</option>
        <option>左3</option>
        <option>左4</option>
        <option>左5</option>
    </select>
    <span>
   	<button onclick="toRight()">>></button>
   	<button onclick="toLeft()"><<</button>
   </span>
    <select id="select2" multiple="multiple" size="10">
        <option>右1</option>
        <option>右2</option>
        <option>右3</option>
        <option>右4</option>
        <option>右5</option>
    </select>
    <script type="text/javascript">
    var select1 = document.getElementById("select1");
    var select2 = document.getElementById("select2");
    function toRight() {
        var childs = select1.childNodes;
        for (var i = 0; i < childs.length; i++) {
            if (childs[i].selected) {
                select2.appendChild(childs[i]);
            }
        }
    }
    function toLeft() {
        var childs = select2.childNodes;
        for (var i = 0; i < childs.length; i++) {
            if (childs[i].selected) {
                select1.appendChild(childs[i]);
            }
        }
    }
    </script>
</body>
</html>