function中uname要和id的值相匹配，但是这样不专业，要显示我的专业性，我将使用document获得name的值来判断是否为空，应为这样是专业的写法，我要时刻记住我是专业的
<script type="text/javascript" src="js/jQuery1.11.1.js"></script></head>
<script type="text/javascript">
function mu(){
if(uname.value.length==0){
alert("不能为空");
return false;
}
}
function mu(){
var uname = document.all("name");
if(uname.value.length==0){
alert("不能为空");
return false;
}
}
</script>
<body>
<form id="form" method="post" action="AttencesServlet?XG=xg" onsubmit="return mu()" >
<table align="center" >
<tr>
<td>员工姓名</td>
<td>所属部门</td>
<td>考勤日期</td>
<td>考勤状态</td>
</tr>
<c:forEach items="${nameList}" var="item">
<tr>
<td><input id="uname" type="text" value="${item.empName }" name="name" /></td>
<td><input type="text" value="${item.dept } " name="dept" /></td>
<td><input type="text" value="${item.chkDate }" name="dates" /></td>
<td>
<select name="status" >
<c:if test="${item.status eq '未考勤' }">
<option value="未考勤" selected="selected">未考勤</option>
<option value="已考勤">已考勤</option>
</c:if>
<c:if test="${item.status eq '已考勤' }">
<option value="未考勤">未考勤</option>
<option value="已考勤" selected="selected">已考勤</option>
</c:if>
</select>
<!--
<option value="未考勤">未考勤</option>
<option value="已考勤">已考勤</option>
-->
</td>
<td><input type="submit" /></td>
<td><input type="hidden" value="${item.id}" name="id" /></td>
</tr>
</c:forEach>
</table>
</form>
</body>
