父组件

App.vue父组件，引用子组件nav-header。属性headData属性

<template>
  <div id='app'>
   <nav-header :headData="headData" ></nav-header>
<router-view  @headFun="headFun" ></router-view>
  </div>
</template>
<script>
import NavHeader from '@/components/NavHeader'
export default {
  name: 'app',
  components: {
   NavHeader
  },
  data() {
    return {
      headData: [],
    }
  },
  mounted() {
  },
  methods: {
   headFun(data){
    //data是App.vue的子组件通过this.$emit触发他的headFun函数传过来的值
      this.headData=data;
    }
  }
}
</script>

子组件通过props接收父组件App.vue的参数

<template>
  <div>
  <header  class="ui-header is-fixed" v-show="hidshow"> 
  <div class="ui-header-left">
    <i class="mint-toast-icon mintui mintui-back" v-if="headData.goIcon==true"></i>
  </div>
  <span class="ui-head-title">{
   {headData.title}}</span>
  <div class="ui-header-right">
   <img src="" alt="" v-if="headData.cartIcon==true">
   <img src="" alt="" v-if="headData.perIcon==true">
  <i class="mint-toast-icon mintui mintui-more" v-if="headData.moreIcon==true"></i>
  </div>
</header>
  </div>
</template>
<script>
  export default {
    name: "CityAlphabet",
    props: ['headData'],
    computed: {
    },
    data() {
      return {
        hidshow: false
      }
    },
    methods: {
    }
  }
</script>
<style  scoped>
  .ui-header .is-fixed{top:0;left :0;right:0;position: fixed;z-index: 1}
  .ui-header{width:100%;height:50px;line-height:50px;text-align:center;background-color:#d23a27;box-sizing: border-box;color: #fff;font-size: 17px;position: relative;}
  .mintui{font-size: 25px;display: inline-block;}
  .ui-head-left{position: absolute;left: 0;top: 0;bottom: 0;padding: 0 10px;}
  .ui-head-right{position: absolute;right: 0;top: 0;bottom: 0;padding: 0 10px;display: -webkit-box;line-height: 50px;padding-top: 10px;}
  .ui-head-right i{color: #fff;}
  .ui-head-right .cart-img{width: 30px;height: 30px;}
</style>

另一个相对于App.vue子组件利用this.$emit去触发父组件中的headFun函数

<template>
  <div>
  </div>
</template>
<script>
  export default {
    name: "home",
    computed: {
    },
    data() {
      return {
      }
    },
    mounted(){
      this.$emit("headFun",
      {
        title:'表通',
        goback:'',
        perIcon:true,
        cartIcon:true,
        moreIcon:false
      })
    },
    methods: {
    }
  }
</script>