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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 newNx=document.createElement('i');
var newNy=document.createTextNode('JavaScript');
var newNode=newNx.appendChild(newNy);
var oldNode=document.getElementById('oldnode');
oldNode.parentNode.replaceChild(newNx,oldNode)
}
</script>
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