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<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()"> 将加粗改为斜体</a>
<script type="text/javascript">
function replaceMessage(){
var node1=document.getElementById("oldnode");
var node2=document.createElement("i");
var node3=document.createTextNode("JavaScript");
node2.appendChild(node3);
node1.parentNode.replaceChild(node2,node1);
}
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