JavaScript HTML DOM元素 节点操作汇总

<div id="div1">
  <p id="p1">这是一个段落</p>
  <p id="p2">这是另一个段落</p>
</div>

<script>
  var para=document.createElement("p");
  var node=document.createTextNode("这是新段落。");
  para.appendChild(node);

  var element=document.getElementById("div1");
  element.appendChild(para);
</script>

<ul id="test">
  <li>JavaScript</li>
  <li>HTML</li>
</ul> 
 
<script type="text/javascript">
   var otest = document.getElementById("test"); 
   var newli = document.createElement("li");
   newli.innerHTML="php";
   //otest.insertBefore(newli,otest.lastChild);
   otest.insertBefore(newli,otest.childNodes[1]);
</script>

<div id="div1">
  <p id="p1">这是一个段落。</p>
  <p id="p2">这是另一个段落。</p>
</div>

<script>
  var parent=document.getElementById("div1");
  var child=document.getElementById("p1");
  parent.removeChild(child);
</script>

<div>
  <b id="oldnode">JavaScript</b>是一个很常用的技术，为网页添加动态效果。</div>
  <a href="javascript:replaceMessage()" rel="external nofollow" > 将加粗改为斜体</a>
 
  <script type="text/javascript">
    function replaceMessage(){
    　　var b=document.getElementById("oldnode");
    　　var newNode=document.createElement("i");
    　　newNode.innerHTML=b.innerHTML;
    　　b.parentNode.replaceChild(newNode,b);
    }  
 </script>

<div>
  javascript 
  <p>javascript</p>
  <div>jQuery</div>
  <h5>PHP</h5>
</div>
<script type="text/javascript">
   var int=document.getElementsByTagName("div")[0].childNodes;
   for (var i=0;i<int.length;i++)
   {
     document.write("名字："+int[i].nodeName+"<br>");
   }
   document.write("子节点个数："+int.length+"<br>");
</script>

<div id="con">
  <p>javascript</p>
  <div>jQuery</div>
  <h5>PHP</h5>
</div>
<script type="text/javascript">
  var x=document.getElementById("con");
  document.write("第一个子节点："+x.firstChild.nodeName+"<br>");
  document.write("最后一个子节点："+x.lastChild.nodeName);
</script>

<div id="text">
  <p id="con"> parentNode 获取指点节点的父节点</p>
</div> 
<script type="text/javascript">
  var mynode= document.getElementById("con");
  document.write(mynode.parentNode.nodeName);
</script>

<ul id="myList">
  <li id="item1">Coffee</li>
  <li id="item2">Tea</li>
</ul>
<p id="demo">点击按钮来获得首个项目的下一个同胞。</p>
<button onclick="myFunction()">试一下</button>
<script>
  function myFunction()
  {
    var x=document.getElementById("demo"); 
    x.innerHTML=document.getElementById("item1").nextSibling.innerHTML;
  }
</script>