用JQuery实现全选与反选功能。不过下面代码中实现的反选功能对全选有影响，尚未找到解决办法，如下图：
代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="../js/jquery-1.8.2.js"></script>
</head>
<body>
<table align="center">
<tr>
<th>状态</th>
<th>用户名</th>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>赵</td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>钱</td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>孙</td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>李</td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>周</td>
</tr>
<tr>
<td>
<input type="checkbox"/>全选
</td>
<td><input type="button" value="全反选"/></td>
</tr>
</table>
<script type="text/javascript">
$(":checkbox:last").click(function(){
//全选
if($(":checkbox:last").is(":checked")){
$(":checkbox:not(:last)").attr("checked","checked");
}else{
$(":checkbox:not(:last)").removeAttr("checked","checked");
}
});
//反选
$(":button").click(function(){
//方式一
$(":checkbox").not(":checkbox:last").each(function(){
if($(this).is(":checked")){
$(this) .removeAttr("checked","checked");
}else{
$(this).attr("checked","checked");
}
});
/*
//方式二
//将已经选中的复选框失效
$(":checkbox:checked").attr("disabled","disabled");
//将剩下的未选中的复选框选中
$(":checkbox:not(:checked)").attr("checked","checked");
//将失效的复选框生效
$(":checkbox:disabled").removeAttr("disabled","disabled").removeAttr("checked","checked");
*/
});
</script>
</body>
</html>
![用jQuery实现一个简易的聊天框[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)