1、添加DOM节点
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<ul id="parent">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
<button onclick="func()">增加DOM节点</button>
<script type="text/javascript">
var n=5;
function func(){
var li=document.createElement("li");
var nodeText=document.createTextNode(n);
li.appendChild(nodeText);
var parent=document.getElementById("parent");
parent.appendChild(li);
n++;
}
</script>
</body>
</html>
项目结果：
2、删除DOM节点
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<ul id="parent">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
<button onclick="func()">增加DOM节点</button>
<button onclick="func2()">删除DOM节点</button>
<script type="text/javascript">
var n=5;
function func(){
var li=document.createElement("li");
var nodeText=document.createTextNode(n);
li.appendChild(nodeText);
var parent=document.getElementById("parent");
parent.appendChild(li);
n++;
}
function func2(){
var parent=document.getElementById("parent");
var lis=document.getElementsByTagName("li");
var len=lis.length;
parent.removeChild(lis[len-1]);
n--;
}
</script>
</body>
</html>
项目结果：
3、修改DOM节点