docs: function updateDOMListeners (oldVnode, vnode) {
    if (!oldVnode.data.on && !vnode.data.on) {
      return
    }
    var on = vnode.data.on || {};
    var oldOn = oldVnode.data.on || {};
    updateListeners(on, oldOn, function (event, handler, capture) {
      if (capture) {
        console.log('Jud do not support event in bubble phase.');
        return
      }
      vnode.elm.addEvent(event, handler.bind(vnode.context));
    }, function (event) {
      vnode.elm.removeEvent(event);
    }, vnode.context);
  }