vue业务实例之组件递归及其应用

2024-04-02 19:04:59 416人浏览八月长安

摘要

目录递归简介Vue实现组件递归调用效果及代码组件递归案例递归实现菜单栏调用效果及代码递归生成菜单仓库源码总结递归简介含义：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

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

<!--
 * @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

<!--
 * @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>