checkbox全选：js全选,jquery全选

<script type="text/javascript">
function SelectAll() {
 var checkboxs=document.getElementsByName("checkboxid");
 for (var i=0;i<checkboxs.length;i++) {
  var e=checkboxs[i];
  e.checked=!e.checked;
 }
}
</script>
<a href="#" onclick="SelectAll()">全选/反选</a>
<form name="checkboxform">
<input type="checkbox" name="checkboxid" id="checkboxid" value="11" />
</form>

$(function () {
    $('#chkall').bind('click', function () {
        var checked = $(this).attr("checked");
        if (checked) {
            $("input[name='HandId']").attr("checked", $(this).attr("checked"));
        } else {   $("input[name='HandId']").removeAttr("checked");//attr("checked",false);
        }

    });
});