java analog form login page From there onsubmint attribute prevents the automatic submission

How to handle this onsubmint the program can automatically login

<form name="login" action="redirct_index.htm" method="post" onsubmit="return formSubmit2(this);">

  function formSubmit2()
  {
      var oUserName = document.getElementById("userName");
      var oPassword = document.getElementById("password");
      if (1 == vldcode_en)
      {
          var oVldcode = document.getElementById("vldcode");
      }
  
      if (0 == oUserName.value.length)
      {
          document.getElementById("messages").innerHTML="请输入用户名！";
          oUserName.focus();
          return false;
      }
      /*
      if (0 == oPassword.value.length)
      {
          document.getElementById("messages").innerHTML="请输入密码！";
          oPassword.focus();
          return false;
      }
      */
      if(!checkStringChar(oPassword,' '))
      {
          document.getElementById("messages").innerHTML="密码不能包含空格！";
          oPassword.focus();
          return false;
      }
  
      oUserName.value = trim(oUserName.value);
      //oPassword.value = trim(oPassword.value);
  
      if (1 == vldcode_en)
      {   
          oVldcode.value  = trim(oVldcode.value);
  
          if ( oVldcode.value == "" )
          {
              document.getElementById("messages").innerHTML="请输入验证码！";
              if (1 == mapOvertime)
              {
                  get_vldbmp();
              }
              else
              {
                  oVldcode.focus();
              }
              return false;
          }
          else if (1 == mapOvertime)
          {
              document.getElementById("messages").innerHTML="验证码已超时，请重新输入！";
              get_vldbmp();
              return false;
          }
          else if (!/(^[a-zA-Z0-9]{4}$)/.test(oVldcode.value)) 
          {
              document.getElementById("messages").innerHTML="验证码错误！";
              return false; 
          }
      }
      
      set_cookie("userName", escape(oUserName.value), null, "/");
      set_cookie("password", oPassword.value, null, "/");
      if (1 == vldcode_en)
      {
          set_cookie("vldcode", oVldcode.value, null, "/");
      }
      
      var d = new Date;
      document.login.rtime.value = (d.getTime() / 500);
      
      return true;
  }
  

  var copyright_time="2008-2013";
  var deviceName =  "H3C S1626"; 
  var messages = "";
  var vldcode_en = 0;
  

vldcode = 0 indicates no authentication code, the rest is the user name and password , and I fill in the user name and password, and the result was 401


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placed directly inside the page load event can not do ?
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How to put ?   You certainly inside the text box to enter data, then how do you then automatically submit ? Textbox trigger event , triggered the corresponding cursor leaves the js function , a little Meinong Dong you mean !
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wooden people ah ?
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How to put ?
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How to put ?        You certainly inside the text box to enter data, then how do you then automatically submit ? Textbox trigger event , triggered the corresponding cursor leaves the js function , a little Meinong Dong you mean !  

Thank you, I have done, use HTMLUNIT. This should slow down , but with the bad. Results posted .
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with Onload
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? ? ?