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<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>無標題文檔</title></head><body><div><b id="oldnode">JavaScript</b>是一個很常用的技術，為網頁添加動態效果。</div><a href="javascript:replaceMessage()"> 將加粗改為斜體</a><script type="text/javascript">function replaceMessage(){var oldNode=document.getElementById("oldnode"); //提取老元素；var newNode=document.createElement("i");//建立一個新的節點；newNode.innerHTML=oldNode.innerHTML;//把舊的oldnode內容賦值給新的newnode，要不然newnode是無內容，只是簡單的改了個屬性，把b變成了i，顯示出來的是空；oldNode.parentNode.replaceChild(newNode,oldNode);//實現子節點(對象)的替換，返回被替換對象的引用；} </script></body></html>
javaScript替換元素節點
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