关于前端:业务实例vue组件递归及其应用

递归简介

含意：程序调用本身的编程技巧称为递归，那组件调用本身就是组件递归

利用场景：在理论业务开发中，通常利用于菜单栏、树组件、多级下拉框等

vue 实现组件递归

调用成果及代码

<!--
 * @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

须要递归的组件，必须写组件名 name，能够在代码中间接应用 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">
            <!-- 间接应用本身组件 -->
            <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

调用成果及代码

<!--
 * @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>
                <!-- 递归本身 -->
                <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

后续补充