In the VUE framework, if the subcomponent calls back multiple parameters through the $emit event

pseudo code is as follows: 

  <div class="" v-for="(item,index) in arr" :key="index">
        < @change="dosomething"></>
  </div>
<script>
...
methods:{
dosomething:function(parame1)
{
    //  index    
          
}

</script>

this.$emit("change",this.);
If you write

@ change= "dosomething" in this way, parame1 gets the value passed by the child component. If @ change= "dosomething (index)", parame1 is the index passed by the parent component. If you cannot get the value passed by the child component

Thank you all in advance

Vue-cli vue.js
Jun.10,2022

you can pass index to child components through props 



:


1index


<child-compnent :index="index" @change="dosomething"/>

// index
this.$emit('change', {val: '', index: 'xxx'});


 2. Store it on the data attribute, such as 


<child-compnent :data-index="index" @change="dosomething"/>

// index
this.$emit('change', {val: '', index: index});


 3, use arguments 


<child-compnent @change="dosomething(arguments, index)"/>

// 
this.$emit('change', {val: ''});

// 
methods: {
    dosomething(obj, index) {
        const val = obj[0];
    }
}


 4. Other methods are temporarily sufficient

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