b/s web工程上传附件 js

<form name="DynaForm" enctype="multipart/form-data" onSubmit="return check();">

</form>

function check(){
   //alert("aaaaaaaaaaaaaaa");
   var worktask=document.getElementById("worktask").value;
   var limittime=document.getElementById("limittime").value;
   var count_stage=document.getElementById("count_stage").value; 

   var leader=document.getElementById("leader").value;  
   var reportdept=document.getElementById("reportdept").value;
  
   worktask=trim(worktask);
   limittime=trim(limittime);
   count_stage=trim(count_stage);
   leader=trim(leader);
   reportdept=trim(reportdept);
   
   if(worktask==""){
        alert("请填写工作任务");
       return false;
   }
    if(limittime==""){
        alert("请填写完成时限");
     return false;
   }
    if(count_stage==""){
         alert("请填写工作任务阶段数量");
      return false;
   }
    if(leader==""){
        alert("请填写分管领导");
     return false;
   }
    if(reportdept==""){
          alert("请填写承办科室(人员)");
    return false;
   }
   //alert("-----------"+count_stage);
    if(count_stage>0){
   for(i=1;i<=count_stage;i++){
    //alert("----"+i);
    var startdate = "workstartdate"+i;
    var enddate = "workenddate"+i;
    
    var workstartdate = document.getElementById(startdate).value;
    var workenddate = document.getElementById(enddate).value;
    
    if(!checkDate(workstartdate,workenddate)){
     alert("第"+i+" 阶段工作起始日期："+workstartdate+"不能在结束日期："+workenddate+"之后，请重新选择日期");
     return false;
    }
    var workcontent = "workcontent" +i;
    //alert("-1---"+workcontent);
    var workcontent = document.getElementById(workcontent).value;
    if(workcontent==""){
       alert("请填写第"+i+" 阶段工作内容");
       return false;
    }
   }
   }
   if(true) {
   
    document.DynaForm.action="save.jsp";
          document.DynaForm.method="post";
          document.DynaForm.enctype="multipart/form-data";
          document.DynaForm.submit();
    return true;
   }
 }