Usuario e login checar arquivo javascript

faça a checagem de usuario na base de um arquivo javascript

by thvinic

HTML

<form name="loginForm" method="post" action="admin.html">
  <table width="20%" align="center">

    <tr>
      <td colspan=2>
        <center>
          <font size=4><b>Insira sua chave de login</b></font>
        </center>
      </td>
    </tr>

    <tr>
      <td>Usuario:</td>
      <td><input type="text" size=25 name="userid"></td>
    </tr>

    <tr>
      <td>Senha:</td>
      <td><input type="Password" size=25 name="pwd"></td>
    </tr>

    <tr>
      <td><input type="Reset"></td>
      <td><input type="submit" onclick="return check(this.form)" value="Login"></td>
    </tr>

  </table>
</form>

JavaScript

function check(form) {

  if (form.userid.value == "123" && form.pwd.value == "123"){
      form.action = "https://www.google.com.br";
      return true;
  }
  else if(form.userid.value == "admin2" && form.pwd.value == "noahgrocery2"){
      form.action = "#";
      return true;
  } else {
    alert("Seu login no sistema é inválido")
    return false;
  }
}