<div>
  这里是中文
  <!--{jp}ここは日本語です-->
  <!--{en}Here is English-->
</div>
<script src="https://unpkg.com/translater.js/dist/translater.js" type="text/javascript"></script>
<script type="text/javascript">
var tran = new Translater({
  lang:"jp"
});
</script>

<a href="javascript:tran.setLang('default');">English</a>
<a href="javascript:tran.setLang('jp');">日本語</a>
<a href="javascript:tran.setLang('cn');">中文</a>

<div>
  这里是中文
  <!--{jp}ここは日本語です-->
  <!--{en}Here is English-->
</div>

<img 
  alt="image" 
  alt-cn="图片" 
  alt-jp="画像" 
  title="image2" 
  title-cn="图片2" 
  title-jp="画像2" 
  src="../img/imgae.jpg" 
  data-lang-cn="../img/imgae_cn.jpg" 
  data-lang-jp="../img/imgae_jp.jpg"
/>

<input type="text" placeholder="like this?"  placeholder-cn="像这样？"  />
<input type="button" value="button" value-cn="按钮" value-jp="按钮日本"  />

<script type="text/javascript">
  var tran = new Translater();
  if (tran.getLang() === "default") tran.setLang('en');
</script>