function actionEvent(methodname){          var form = document.forms[0];          if(validateIsSelect(form.all, form.productids)){              form.action='<html:rewrite action="/control/product/manage"/>';              form.submit();          }else{              alert("请选择要操作的记录");          }  }  function allselect(allobj,items){          var state = allobj.checked;          if(items.length){              for(var i=0;i<items.length;i++){                  if(!items[i].disabled) items[i].checked=state;              }          }else{              if(!items[i].disabled) items.checked=state;          }  }  /* * 判断是否选择了记录 */  function validateIsSelect(allobj,items){          var state = allobj.checked;          if(items.length){              for(var i=0;i<items.length;i++){                  if(items[i].checked) return true;              }          }else{              if(items.checked) return true;          }          return false;  }

<INPUT TYPE="checkbox" NAME="all"  onclick="javascript:allselect(this, this.form.productids)">全选</td>

<input name="visible" type="button" class="frm_btn" onClick="javascript:actionEvent('visible')" value=" 操作 ">