<form action="" name="form1" id="form1" target="nm_iframe">
ID: <input type="text" name="listId" id="listId"> <br>语文:
<input type="text" name="listYuwen" id="listYuwen" onblur="zcj()">
<br>数学: <input type="text" name="listShuxue" id="listShuxue"
onblur="zcj()"> <br>外语: <input type="text"
name="listWaiyu" id="listWaiyu" onblur="zcj()"> <br>总成绩:
<input type="text" name="listZonghe" id="listZonghe"> <br>
<h1>操作记录:</h1>
<textarea name="textfield3" id="textfield3" cols="80" rows="20"></textarea>
<br> <input type="button" value="新增成绩" type="submit"
id="id_submit" name="nm_submit"
onclick="form1.action='doInitMylist.jsp';form1.submit();jl();" /> <input
type="button" value="删除成绩" type="submit" id="id_submit"
name="nm_submit"
onclick="form1.action='dodelete.jsp';form1.submit();"> <input
type="button" value="修改成绩 " type="submit" id="id_submit"
name="nm_submit"
onclick="form1.action='changeMylist.jsp';form1.submit();">
</form>
想实现的功能如示例图,我点击增加按钮,下面文本域就写一条增加信息,如果我再点击一次增加就继续加入一条增加信息,不会覆盖上次的信息,追加形式。这个JS函数怎么写,求源码!