發現這個小功能挺普遍，偶爾會用到。特別是在列表操作的時候，寫個Demo。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>checkBox的全選和取消</title>
<script src="http://code.jquery.com/jquery-1.4.4.min.js" type="text/javascript"></script>
<script type="text/javascript">
jQuery(function(){
$("#checkAll").click(
function(){
if($("#checkAll").attr("checked")==true){
$("input[name$='item']").attr("checked","true");
$("#delete").removeAttr("disabled");
}else{
$("input[name$='item']").removeAttr("checked");
$("#delete").attr("disabled","disabled");
}
}
);
$("input[name$='item']").click(
function(){
var $chk = $("[name = item]:checkbox");
if($(this).attr("checked")==true){
$("#delete").removeAttr("disabled");
}
else{
if($("input:checked[name$='item']").length==0){
$("#delete").attr("disabled","disabled");
}
}
$("#checkAll").attr("checked", $chk.length == $chk.filter(":checked").length);
}
);
});
</script>
</head>
<body>
<div>
<input type="button" id="delete" name="delete" value="刪除" disabled="disabled">
<table id="gvData" border="1" cellspacing="1">
<thead >
<tr>
<th>
<input id="checkAll" name="checkAll" type="checkbox"/>
</th>
<th>車牌號</th>
<th>起運地</th>
<th>目的地</th>
</tr>
</thead>
<tbody>
<tr>
<td><input id="001" name="item" type="checkbox"/></td>
<td>浙A898800</td>
<td>寧波</td>
<td>杭州</td>
<tr/>
<tr>
<td><input id="002" name="item" type="checkbox"/></td>
<td>浙A898800</td>
<td>寧波</td>
<td>杭州</td>
<tr/>
<tr>
<td><input id="003" name="item" type="checkbox"/></td>
<td>浙A898800</td>
<td>寧波</td>
<td>杭州</td>
<tr/>
<tr>
<td><input id="004" name="item" type="checkbox"/></td>
<td>浙A898800</td>
<td>寧波</td>
<td>杭州</td>
<tr/>
</tbody>
</table>
</div>
</body>
</html>