<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title></head><body> <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 newnode=document.createElement("i"); var newnodeText=document.createTextNode("javascript"); newnode.appendChild(newnodeText); var oldnode=document.getElementsByTagName("b"); oldnode.parentNode.replaceChild(newnode,oldnode); } </script> </body></html>这里不用id,用TagName来做不行么？
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