我的JSP页面代码，JS有点问题。但是不知道怎样解决。只想图片按钮可以提交表单

Question

<%@ page contentType="text/html; charset=gbk" %>

登陆页面


<br> function check(){<br> var uname = document.all.uname.value;<br> var upwd = document.all.upwd.value;<br> if(uname.trim()==&quot;&quot;){<br> alert(&quot;用户名为空,请重新输入!!!&quot;);<br> return;<br> }<br> if(upwd.trim()==&quot;&quot;){<br> alert(&quot;密码为空,请重新输入!!!&quot;);<br> return;<br> }<br> document.all.mf.submit();<br> }<br>

用户名:
密 码:
style="cursor:hand" onmouseover="document.all.lg.src='img/ddla.gif'" onmouseout="document.all.lg.src='img/ddl.gif'" onmouseup="document.all.lg.src='img/ddla.gif'" onmousedown="document.all.lg.src='img/ddlb.gif'"/> style="cursor:hand" onmouseover="document.all.cz.src='img/cza.gif'" onmouseout="document.all.cz.src='img/cz.gif'" onmouseup="document.all.cz.src='img/cza.gif'" onmousedown="document.all.cz.src='img/czb.gif'"/>

Answer 1

代码太乱，发个demo给你，少用document.all，only ie支持

 <script type="text/javascript">
function check(){
  var f=document.form1;
  if(f.uname.value==''){alert('用户名为空,请重新输入!!!');f.uname.focus();return false;}
  if(f.upwd.value==''){alert('密码为空,请重新输入!!!');f.upwd.focus();return false;}
  f.submit()
}
</script>

<form name="form1">
用户名：<input type="text" name="uname"/><br/>
密　码：<input type="password" name="upwd"/>
<img src="1.jpg" onclick="check()"/>
</form>