js 全选

<ec:column width="10%" property="_0" style="text-align: center;"
title='<input type="checkbox" id="mmAll" name="mmAll" title="mm" onclick="checkAll(this, this.title)">'>
<input type="checkbox" name="mm" value="${record.userId }"
onclick="checkItem(this, 'mmAll')">
</ec:column>




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;
  }
}