HTML中利用JavaScript根据屏幕分辨率打开对应的页面

<script type='text/javascript'>
  if(window.screen)
  {
    var m_height = screen.height;
    m_768 = "login_768.html";
    m_900 = "login_900.html";
    if(m_height<900)
    {
      self.location.replace(m_768.html);
    }
    if(m_height>=900)
    {
      self.location.replace(m_900.html);
    }
</script>