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;         }     }