添加和删除节点实例：
<!DOCTYPE html>
<html>
<body>
<script>
function addOnclick(){
var para=document.createElement("p");
var node=document.createTextNode("This is new.");
para.appendChild(node);
var element=document.getElementById("div1");
element.appendChild(para);
}
function removeOnclick(){
var parent=document.getElementById("div1");
var child=document.getElementsByTagName("p");
parent.removeChild(child[child.length-]);
}
</script>
<div id="div1">
<p id="p1">This is a paragraph.This is p1</p>
<p id="p2">This is another paragraph.</p>
</div>
<button onclick="addOnclick();">点击添加</button>
<button onclick="removeOnclick();">点击删除</button>
</body>
</html>
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