checkbox全选

function checkAll(e, itemName){
   var aa = document.getElementsByName(itemName);
   for (var i=0; i<aa.length; i++)
   aa[i].checked = e.checked;
}

function checkItem(e, allName){
   var all = document.getElementsByName(allName)[0];
   if(!e.checked) all.checked = false;
   else
   {
     var aa = document.getElementsByName(e.name);
     for (var i=0; i<aa.length; i++)
     if(!aa[i].checked) return;
     all.checked = true;
    }
}

 <th><input type="checkbox" name="chkAll" id="chkAll" value="" onclick="checkAll(this, 'ids')"></th>

......

<td><input type="checkbox" name="ids" value="" onclick="checkItem(this, 'chkAll')"></td>