Control between Vue components

there are two components, component An and component B, and there is a player in component A, and the playback and stop events of the player are added, which requires that multiple buttons of component B can also be clicked to allow the player of component A to play. and each click will pause the previous one and immediately play the next

. 
A

 <img :src="start" alt="-sharp" @click="changestart" class="seta">


 changestart() {
      if (this.start == "../../static/pic/start.png") {
        this.start = "../../static/pic/stop.png";
        this.$refs.player.play();
      } else {
        this.start = "../../static/pic/start.png";
        this.$refs.player.pause();
      }
bclick
<li v-for="(songNamelist,songIndex) in songName" v-bind:key="songIndex" class="songlist" @click="songChoose(songIndex,"/play")">

    songChoose(songIndex,z) {
      this.$router.replace(z)
      this.isresearch = false;
      this.ishow=false;
      this.keyword="";
    },

there is an idea, because Vuex, clicks the B component button and uses mutation to submit and modify state.xxx=true,A components to find the parameter xxx=true of state and then perform playback, but the playback function does not know where to write 


this.$refs.player.play()

cannot be written into created, because A has not been reloaded. I don"t know what to trigger when written to A"s methods. Watch has also tried. Xxx does not know where to set it to false,. Please give me a solution or an idea. Thank you very much.

Vuex vue.js javascript
Apr.08,2021

Let me give you a reference to the method I used before:
A component 

    computed: {
        changeXxx(){
            return this.$store.state.xxx; 
        },
    },
    watch: {
        changeXxx(val){
            // 
            this.$refs.player.play();

            // xxxfalse
            this.$store.commit("updateXXX",false);
        },    
    },

vuex 

updateXXX(state,val){
      state.xxx = val;
},

just write a custom events to handle it, subscriber mode, A listens for an event through events during initialization, and B initiates an event through events.

in theory, watch should be OK. When you change, call your own methods to change the state, and submit a mutation to change the xxx back.

is actually two methods of component communication

  1. event bus
  2. vuex

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