jQuery实现CheckBox全选、全不选

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>jQuery实现CheckBox全选、全不选</title>
<script src="http://code.jquery.com/jquery-1.4.4.min.js" type="text/javascript"></script>    <script type="text/javascript">
        $(function() {
           $("#checkAll").click(function() {
                $('input[name="subBox"]').attr("checked",this.checked); 
            });
            var $subBox = $("input[name='subBox']");
            $subBox.click(function(){
                $("#checkAll").attr("checked",$subBox.length == $("input[name='subBox']:checked").length ? true : false);
            });
        });
    </script>
 
</head>
<body>
    <div>
        <input id="checkAll" type="checkbox" />全选
        <input name="subBox" type="checkbox" />项1
        <input name="subBox" type="checkbox" />项2
        <input name="subBox" type="checkbox" />项3
        <input name="subBox" type="checkbox" />项4
    </div>
</body>
</html>