vue父组件获取子组件中input值

子组件

<template>
    <div>
    <input type="text" class="form-control" id="inputEmail3" placeholder="test" v-on:input="input_name($event.target.value)">
    </div>
</template>
<script>
export default {
    props:['count'],
    name:"Test",
    methods:{
        input_name(e) {
            this.$emit("input", e);
        }
    }
}
</script>

父组件

<template>
 <div class="all">
   <Test  v-model="result" @input="input"></Test>
 <button type="button" class="btn btn-primary" @click="test">提交</button>
 </div>
</template>

<script>
import Test from './Test'
export default {
 name:"All",
 components:{Test},
 data(){
     return{
          result:"",
     }
 },
 methods:{
   input(key){
     this.result=key;
   },
   test(){
     console.log(this.result)
   }
 }
}