递归简介

含义:程序调用自身的编程技巧称为递归,那组件调用自身就是组件递归

应用场景:在实际业务开发中,通常应用于菜单栏、树组件、多级下拉框等

vue实现组件递归

调用效果及代码

show1.png

<!--
 * @Date: 2020-12-09 17:52:54
 * @Author: surewinT 840325271@qq.com
 * @LastEditTime: 2022-05-10 14:14:15
 * @LastEditors: surewinT 840325271@qq.com
 * @Description: 调用页面
-->

<template>
    <div class="">
        <div v-for="(item, index) in testList" :key="index">
            <Test :listitem="item" />
        </div>
    </div>
</template>

<script>
import Test from "./test.vue";
export default {
    components: {
        Test,
    },
    props: [],
    data() {
        return {
            testList: [
                {
                    name: "你好啊",
                    value: "1",
                    children: [
                        {
                            name: "你好啊",
                            value: "1-1",
                        },
                        {
                            name: "你好啊",
                            value: "1-2",
                            children: [
                                {
                                    name: "你好啊",
                                    value: "1-2-1",
                                },
                            ],
                        },
                    ],
                },
                {
                    name: "好的呢",
                    value: "2",
                    children: [],
                },
            ],
        };
    },
    mounted() {},
    watch: {},
    methods: {},
};
</script>

<style lang='scss' scoped>
.p-el-menu {
    width: 200px;
}
</style>

组件递归案例

需要递归的组件,必须写组件名name,可以在代码中直接使用name进行调用

<!--
 * @Date: 2022-05-10 11:30:50
 * @Author: surewinT 840325271@qq.com
 * @LastEditTime: 2022-05-10 14:15:09
 * @LastEditors: surewinT 840325271@qq.com
 * @Description: 组件递归案例
-->

<template>
    <div class="test-root">
        {{ `${listitem.value}${listitem.name}` }}
        <div v-for="(item, index) in listitem.children" :key="index">
            <!-- 直接使用自身组件 -->
            <Test :listitem="item" />
        </div>
    </div>
</template>

<script>
export default {
    // 必须写name
    name: "Test",
    components: {},
    props: ["listitem"],
    data() {
        return {};
    },
    mounted() {},
    watch: {},
    methods: {},
};
</script>

<style lang='scss' scoped>
.test-root {
    padding: 20px;
    display: inline-block;
    border: 1px solid #409eff;
    margin: 10px 0;
}
</style>

递归实现菜单栏

调用效果及代码

show2.jpg

<!--
 * @Date: 2020-12-09 17:52:54
 * @Author: surewinT 840325271@qq.com
 * @LastEditTime: 2022-05-10 14:20:32
 * @LastEditors: surewinT 840325271@qq.com
 * @Description: 调用页面
-->

<template>
    <div class="">
        <el-menu class="p-el-menu">
            <Menutree :menuList="menuList" />
        </el-menu>
    </div>
</template>

<script>
import Menutree from "./p-el-menu.vue";
export default {
    components: {
        Menutree,
    },
    props: [],
    data() {
        return {
            menuList: [
                {
                    label: "菜单1",
                    value: "1",
                    children: [
                        {
                            label: "菜单1-1",
                            value: "1-1",
                        },
                        {
                            label: "菜单1-2",
                            value: "1-2",
                            children: [
                                {
                                    label: "菜单1-2-1",
                                    value: "1-2-1",
                                },
                            ],
                        },
                    ],
                },
                {
                    label: "菜单2",
                    value: "2",
                    childern: [],
                },
                {
                    label: "菜单3",
                    value: "3",
                    children: [
                        {
                            label: "菜单3-1",
                            value: "3-1",
                        },
                    ],
                },
            ],
        };
    },
    mounted() {},
    watch: {},
    methods: {},
};
</script>

<style lang='scss' scoped>
.p-el-menu {
    width: 200px;
}
</style>

递归生成菜单

<!--
 * @Date: 2022-05-10 11:45:08
 * @Author: surewinT 840325271@qq.com
 * @LastEditTime: 2022-05-10 14:28:58
 * @LastEditors: surewinT 840325271@qq.com
 * @Description: 递归生成菜单
-->

<template>
    <div class="">
        <div v-for="(menu, index) in menuList" :key="index">
            <el-menu-item v-if="!menu.children || menu.children.length == 0" :index="menu.value">
                <i :class="menu.icon ? menu.icon : 'el-icon-menu'"></i>
                <span slot="title" class="group_title">{{ menu.label }}</span>
            </el-menu-item>
            <el-submenu v-else :index="menu.value">
                <template slot="title">
                    <i :class="menu.icon ? menu.icon : 'el-icon-menu'"></i>
                    <span>{{ menu.label }}</span>
                </template>
                <!-- 递归自身 -->
                <p-el-menu :menuList="menu.children" />
            </el-submenu>
        </div>
    </div>
</template>

<script>
export default {
    // 必须写name
    name: "p-el-menu",
    components: {},
    props: ["menuList"],
    data() {
        return {};
    },
    mounted() {},
    watch: {},
    methods: {},
};
</script>

<style lang='scss' scoped>
</style>

仓库源码

作者:|surewinT|,原文链接: http://www.imooc.com/article/325465

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