js操作DOM--添加、删除节点的简单实例
js removeChild() 用法
<body>
<p id="p1">welcome to <b>javascript</b> world !</p>
<script language="javascript" type="text/javascript">
<!--
function nodestatus(node)
{
var temp="";
if(node.nodeName!=null)
{
temp+="nodeName="+node.nodeName+"\n";
}
else temp+="nodeName=null \n";
if(node.nodeType!=null)
{
temp+="nodeType="+node.nodeType+"\n";
}
else temp+="nodeType=null \n";
if(node.nodeValue!=null)
{
temp+="nodeValue="+node.nodeValue+"\n";
}
else temp+="nodeValue=null \n";
return temp;
}
var parent=document.getElementById("p1");
var msg="父节点 \n"+nodestatus(parent)+"\n";
//返回元素节点p的最后一个孩子
last=parent.lastChild;
msg+="删除之前：lastChild--"+nodestatus(last)+"\n";
//删除节点p的最后一个孩子,变为b
parent.removeChild(last);
last=parent.lastChild;
msg+="删除之后：lastChild--"+nodestatus(last)+"\n";
alert(msg);
-->
</script>
</body><html>
<head>
<title>js控制添加、删除节点</title>
</head>
<script type="text/javascript">
var all;
function addParagraph() {
all = document.getElementById("paragraphs").childNodes;
var newElement = document.createElement("p");
var seq = all.length + 1;
//创建新属性
var newAttr = document.createAttribute("id");
newAttr.nodeValue = "p" + seq;
newElement.setAttribute(newAttr);
//创建文本内容
var txtNode = document.createTextNode("段落" + seq);
//添加节点
newElement.appendChild(txtNode);
document.getElementById("paragraphs").appendChild(newElement);
}
function delParagraph() {
all = document.getElementById("paragraphs").childNodes;
document.getElementById("paragraphs").removeChild(all[all.length -1]);
}
</script>
<style>
p{
background-color : #e6e6e6 ;
}
</style>
<body>
<center>
<input type="button" value="添加节点" onclick="addParagraph();"/>
<input type="button" value="删除节点" onclick="delParagraph();"/>
<div id="paragraphs">
<p id="p1">段落1</p>
<p id="p2">段落2</p>
</div>
</center>
</body>
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