11.父组件向子组件传值

<template>
    <div>
        <h2>{{msg}}</h2>
        <v-header :title="title" :run="run"></v-header>
    </div>
</template>
<script>
import Header from "./Header.vue";
export default {
  name: 'home',  
  data () {
    return {
        msg:'首页组件',
        title:'首页传来的值'
    }
  },
  methods:{
    run(data){
      alert(data)
    }
  },
  components:{
    'v-header':Header
  }
}
</script>
<style lang="scss" scoped>
h2{
    color: red;
}
</style>

<template>
    <div>
        <h2>{{msg}}</h2>
        <h2>{{title}}</h2>
        <button @click="run(data)">在子组件执行父组件传过来的方法</button>
    </div>
</template>
<script>
export default {
  name: 'header',  
  data () {
    return {
        msg:'头部组件',
        data:'父组件方法子组件参数'
    }
  },
  methods:{
  },
  props:['title','run'],
  components:{
  }
}
</script>
<style lang="scss" scoped>
h2{
    color: green;
}
</style>