我想把數據通過actions存到state中

//組件中的方法
  methods: {
    selectPlayList(item) {
      this.playList = item
      this.$router.push({
        path: `/playList/${item.id}`
      })
      this.SetplayList(this.playList)
    },
    ...mapActions([
      'SetplayList'
    ])
    // ...mapMutations({
    //   SetplayList: 'SetplayList'
    // })
  }

//actions.js
export const SetplayList = ({commit}, playList) => commit('SetplayList')

//mutations.js
export const SetplayList = (state, payload) => {
  state.playList = payload
}

logger中payload是unfinded,但是用mapmutation就能正確傳數據，這是為什么呢？