js实现datagrid的全选和反选

function DoCheck(flag)
    {
        var inputs = document.forms[0].elements;
        for (var i=0; i < inputs.length; i++)
        if (inputs[i].type == 'checkbox')
        {
            if (flag)
                inputs[i].checked = true;
           else
                inputs[i].checked =!inputs[i].checked;
        }
    }