<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div>
<span></span>
<p></p>
<strong></strong>
</div>
//点击事件
<!-- <p>点击按钮执行<em>displayDate()</em>函数</p>
<button id="myBth">点这里
<p id="demo"></p>
</button>
<script type="text/javascript">
var d= document.getElementById("myBth");
d.onclick=function(){ document.getElementById("demo").innerHTML=Date();}
节点习题
</script> -->
<!-- <script type="text/javascript">
Element.prototype.z=function(){
var child=this.childNodes;//这个可能是对象，插入到数组里会形成类数组 var child =new Array(this.childNodes);这种最保险直接转换为数组
var len=child.length;
var arr=[];
for(var i=0;i<len;i++){
if(child[i].nodeType==1){
arr.push(child[i]);
}
}
return this.children ;}
var div=document.getElementsByTagName('div')[0];
</script> -->
// 增删改知识点
<script type="text/javascript">
var div=document.getElementsByTagName('div')[0];
div.appendChild(div.lastElementChild.previousElementSibling);
var i=document.createElement('i');
div.appendChild(i);
//div.removeChild(i);
i.remove();
div.setAttribute('class','n');
//div.getAttribute('class');
</script>
</body>
</html>