checkedAll.html

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8"/>
</head>
<body>


<input type='checkbox' id='in-shareuser-10' name='shareuser[]' value='10' />UserA
<input type='checkbox' id='in-shareuser-11' name='shareuser[]' value='11' />UserB
<input type='checkbox' id='in-shareuser-12' name='shareuser[]' value='12' />UserC

<input type="button" id="selectall" name="selectall" value="全选" />
<input type="button" id="deselectall" name="deselectall" value="取消全选" />
</body>
</html>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script>
$(function() {
    $("#selectall").click(function() {
        $("input[name='shareuser[]']").each(function() {
            $(this).attr("checked", true);
        });
    });
    $("#deselectall").click(function() {
        $("input[name='shareuser[]']").each(function() {
            $(this).attr("checked", false);
        });
    });
});
</script>