记录使用vuex mutations的一个坑

使用vuex中的mutations改变state里面的全局状态的值，获取到的数据却怎么都是undefined
一开始使用的是这种赋值方式

this.$store.commit('currentSongInfo', res.data.songs[0].name, res.data.songs[0].ar[0].name, res.data.songs[0].al.name, res.data.songs[0].al.picUrl)

mutations: {
    
    
    currentSongId (state, id) {
    
    
      state.songId = id
    },
    currentSongInfo (state, songName, artists, albumName, picUrl) {
    
    
      state.songInfo.artists = artists
      state.songInfo.songName = songName
      state.songInfo.albumName = albumName
      state.songInfo.picUrl = picUrl
    }
  },

数据始终为空

后来发现mutations只能传单个参数，所以把数据放在一个对象传进来

this.$store.commit('currentSongInfo', {
    
    songName: res.data.songs[0].name, artists: res.data.songs[0].ar[0].name, albumName: res.data.songs[0].al.name, picUrl: res.data.songs[0].al.picUrl})

mutations: {
    
    
    currentSongId (state, id) {
    
    
      state.songId = id
    },
    currentSongInfo (state, info) {
    
    
      state.songInfo.artists = info.artists
      state.songInfo.songName = info.songName
      state.songInfo.albumName = info.albumName
      state.songInfo.picUrl = info.picUrl
    }
  },

就可以获取到数据啦