<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>dom操作节点</title><style type="text/css">body{font-size:13px;line-height:25px;}table{ border-top: 1px solid #F00; border-left: 1px solid #F00; width:300px;}td{ border-bottom: 1px solid #3FF; border-right: 1px solid #3FF;}.title{ text-align:center; font-weight:bold; background-color:#0C6;}</style><script type="text/javascript">function one(){ var newtr = document.createElement("tr"); var newtd1 = document.createElement("td"); var text1 = document.createTextNode("图书3"); newtd1.appendChild(text1); var newtd2 = document.createElement("td"); var text1 = document.createTextNode("33.00"); newtd1.appendChild(text2); newtr.appendChild(newtd1); newtr.appendChild(newtd2); document.getElementById("row1").parentNode.appendChild(newtr);}function two(){ var myTable = document.getElementById("myTable"); var colltr = myTable.getElementsBytagname("tr"); if(colltr.length>=2){ var deltr = myTable.getElementsBytagname("tr")[1]; deltr.parentNode.removeChild(deltr); }}function san(){ var gai = document.getElementById("row1"); gai.className = "title";}</script></head><body><table border="0" cellspacing="0" cellpadding="0" id="myTable"><tr id = "row1"><td>书名</td><td>价格</td></tr><tr id = "row2"><td>图书1</td><td>33.00</td></tr><tr id = "row3"><td>图书2</td><td>33.00</td></tr></table><input name="b1" type="button" value="增加一行" onclick="one()"/><input name="b2" type="button" value="删除第2行" onclick="two()"/><input name="b3" type="button" value="修改标题" onclick="san()"/></body></html>打开点击没有效果，什么原因，怎么改呢，刚学dom搞不明白
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