<script type="text/javascript">
$(function(){
//全選
$("#CheckedAll").click(function(){
$('[name=items]:checkbox').attr("checked", this.checked );
});
$('[name=items]:checkbox').click(function(){
//定義一個臨時變數，避免重複使用同一個選取器選擇頁面中的元素，提升程式效率。
var $tmp=$('[name=items]:checkbox');
//用filter方法篩選出選中的複選框。並直接給CheckedAll賦值。
$('#CheckedAll').attr('checked', $tmp.length==$tmp.filter(':checked').length);
});
//輸出值
$("#send").click(function(){
var str="你選中的是：\r\n";
$('[name=items]:checkbox:checked').each(function(){
str+=$(this).val()+"\r\n";
})
alert(str);
});
});
</script>
</head>
<body>
<form method="post" action="">
<b>你愛好的運動是?</b><br/>
<input type="checkbox" id="CheckedAll" />全選/全不選<br/>
<input type="checkbox" name="items" value="足球"/>足球
<input type="checkbox" name="items" value="籃球"/>籃球
<input type="checkbox" name="items" value="羽毛球"/>羽毛球
<input type="checkbox" name="items" value="乒乓球"/>乒乓球<br/>
<input type="button" id="send" value="提 交"/>
</form>
</body>
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