composedPath(e) {
   // 存在则直接return
   if (e.path) {
     return e.path
   }
   // 不存在则遍历target节点
   let target = e.target
   e.path = []
   while (target.parentNode !== null) {
     e.path.push(target)
     target = target.parentNode
   }
   // 最后补上document和window
   e.path.push(document, window)
     return e.path
},