provide 和 inject

https://cn.vuejs.org/v2/api/#provide-inject
https://blog.csdn.net/Min_Fox/article/details/123428325

• 父级页面（src/views/user/member/index.vue）

<template>
    <div class="user">
        <div class="">
            <div>会员用户</div>
        </div>
        <child></child>
    </div>
</template>

<script>
    import child from "@/components/child";
    export default {
        components: {
            child,
        },
        name: 'Member',
        data() {
            return {
                name: 'hszz',
                obj: {
                    name: 'hszz'
                },
            }
        },

        provide() {
            return {
                name: this.name,                // 父级传递的非响应式数据
                xxName: () => this.name,        // 父级传递的响应式数据方法1-通过工厂函数
                obj: this.obj,                  // 父级传递的响应式数据方法2-传递对象
                changeData: this.changeData,    // 暴露给子组件的方法，子组件可通过此方法传值给父级
            }
        },

        methods: {
            changeData(value) {
                this.name = value
                this.obj.name = value
            }
        },
    }
</script>

• 子组件（src/components/child/index.vue）

<template>
    <div>
        <div>子组件</div>

        <div>父级的非响应数据：{{ name }}</div>
        <div>父级的响应数据1.1：{{ cName }}</div>
        <div>父级的响应数据1.2：{{ xxName() }}</div>
        <div>父级的响应数据2.1：{{ obj.name }}</div>


        <el-input v-model="childData"></el-input>
        <el-button type="primary" @click="childChangeData">
            点击把输入框数据传递给父级，修改父级数据
        </el-button>
    </div>
</template>

<script>
export default {
    name: "child",
    data() {
        return {
            childData: "",
        };
    },
    inject: ['name', 'changeData', 'obj', 'xxName'],

    methods: {
        childChangeData() {
            this.changeData(this.childData)
        }
    },

    computed: {
        cName() {
            return this.xxName()
        }
    },
};
</script>

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