checkbox全选

    function checkAll(obj){
        if(obj.checked){
            var checkboxList= document.getElementsByTagName("input");
            for(var i =0;i<checkboxList.length;i++){
                if("checkbox"==checkboxList[i].type){
                    checkboxList[i].checked="true";
                }
            }
        }else{
            var checkboxList= document.getElementsByTagName("input");
            for(var i =0;i<checkboxList.length;i++){
                if(checkboxList[i].type=="checkbox"){
                    checkboxList[i].checked="";
                }
            }
        }
    }
    <display:column title="选择<INPUT name='selectEquipId' type='checkbox' value='' onclick='checkAll(this)'>" style="width: 25">
                                    <INPUT name='selectOne' type='checkbox' value='<c:out value="${row.id}" />'>
   </display:column>