<input type="submit" id="myBtn" />
换成:
 <input type="button" id="myBtn" />

用 
$("#myBtn").click(function(){
   ...//判断验证
});

表单提交js:

function formSubmit(){

   if(flag=="1"){

     $("#form").submit();

   }else if(flag=="2"){

    $("#form").attr("action","deployResult.jsp");
    $("#form").attr("target","_blank");

    $("#form").attr("method","GET");
    $("#form").attr("enctype","application/x-www-form-urlencoded");
    $("#form").attr("encoding","application/x-www-form-urlencoded");
    $("#form").submit();

  }

}