old_contents: var data = {
      idi: {
          "name": "International Design Institute (IDI) ZHEJIANG UNIVERSITY",
          "url": "http://zenozeng.github.io/www.idi.zju.edu.cn",
          "description": "www.idi.zju.edu.cn"
      }
  };
  var href = window.location.href;
  var key = href.split('/').pop();
  if(typeof data[key] != "undefined") {
      var item = data[key];
      var html = '<iframe src="';
      html += item.url;
      html += '" frameborder="0" scrolling="auto" width="100%" height="100%"></iframe>';
      document.body.innerHTML = html;
  }
  
new_contents: var data = {
      idi: {
          "name": "International Design Institute (IDI) ZHEJIANG UNIVERSITY",
          "url": "http://zenozeng.github.io/www.idi.zju.edu.cn",
          "description": "www.idi.zju.edu.cn"
      },
      vs: {
          "name": "VS",
          "url": "http://duck.zenozeng.com:42000/",
          "description": "vs"
      }
  };
  var href = window.location.href;
  var key = href.split('/').pop();
  if(typeof data[key] != "undefined") {
      var item = data[key];
      var html = '<iframe src="';
      html += item.url;
      html += '" frameborder="0" scrolling="auto" width="100%" height="100%"></iframe>';
      document.body.innerHTML = html;
  }
  
subject: add vs to 404.js