import {mapGetters, mapMutations, mapActions} from 'vuex'  
export const playlistMixin = { 
 computed: { 
  ...mapGetters([ 
   'playList' 
  ]) 
 }, 
 mounted() { 
  this.handlePlaylist(this.playList) 
 }, 
 activated() { 
  this.handlePlaylist(this.playList) 
 }, 
 watch: { 
  playList(newVal) { 
   this.handlePlaylist(newVal) 
  } 
 }, 
 methods: { 
  handlePlaylist() { 
   throw new Error('component must implement handlePlaylist method') 
  } 
 }  
} 

import {playlistMixin} from 'common/js/mixin' //引入Mixin 
 export default { 
  mixins: [playlistMixin], 
  methods: { 
    handlePlaylist (playlist) { 
    let bottom = playlist.length > 0 ? '60px' : '' 
    this.$refs.recommend.style.bottom = bottom 
    this.$refs.scroll.refresh() 
   }, 
  } 
 }