来个腿粗的告诉我一下.
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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 new = document.createElement("i");
new.innerHTML = "JavaScript";
var old = document.getElementsById("oldnode");
old.parentNode.replaceChild(new,old)
}
</script>
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