fix(dropdown-mobile): 修复移动端组件dropdownMenu无法正常渲染的问题，顺带修复pc端dropDown组件的警告

src/dropdown-item/vue.js

@@ -93,10 +93,13 @@ const initApi = ({ api, state, emit, props, parent, dispatch, vm }) => {
   })
 }
 
-export const renderless = (props, { computed, reactive, watch, inject }, { parent, emit, vm, dispatch }) => {
+export const renderless = (props, { computed, reactive, watch, inject }, { parent, emit, vm, dispatch, mode }) => {
   const api = {}
   const dropdownMenu = inject('dropdownMenu', null)
 
+  if (mode === 'mobile') {
+    dropdownMenu.state.children = [...dropdownMenu.state.children, vm]
+  }
   parent = parent.$parent
 
   const state = initState({ reactive, computed, api, props, parent, dropdownMenu })

src/dropdown-menu/vue.js

@@ -16,8 +16,8 @@ export const api = ['state', 'toggleItem', 'updateOffset', 'clickOutside', 'doDe
 
 export const renderless = (props, hooks, instance) => {
   const api = {}
-  const { reactive } = hooks
-  const { refs, nextTick, mode } = instance
+  const { reactive, provide } = hooks
+  const { refs, nextTick, mode, vm } = instance
   const state = reactive({
     offset: 0,
     scroller: null,
@@ -27,6 +27,7 @@ export const renderless = (props, hooks, instance) => {
   })
 
   if (mode === 'mobile') {
+    provide('dropdownMenu', vm)
     nextTick(() => {
       state.scroller = getScroller(refs.menu)
     })