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// B.vue
 
<template>
    <div>
        B:{{demo}}
        <comC></comC>
    </div>
</template>
 
<script>
    import comC from './C.vue'
    export default {
        name: "B",
        inject: ['for'],
        data() {
            return {
                demo: this.for
            }
        },
        components: {
            comC
        }
    }
</script>