let guid = function() { //获取随机ID，组件拖到预览视图后就会被设置个ID
  function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
      .toString(16)
      .substring(1);
  }
  return s4() + s4() + '-' + s4()
}
export default guid
