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根据业务需求，有时我们需要针对不同角色展示不同的菜单，uniapp默认的菜单配置就不适用了，但是我们可以自己自定义配置菜单栏

步骤如下：

1、page.json问价去掉默认的tabBar配置项；

2、在component目录下，新建一个tabBar.vue组件,这个组件里就是配置动态的底部菜单栏

tabBar.vue代码参考:

<template>
	<view class="uni-tabbar">
		<view class="uni-tabbar__item" v-for="(item,index) in tabbar" :key="index" @tap="changeTab(item)">
			<view class="uni-tabbar__bd">
				<view class="uni-tabbar__icon">
					<image v-if="item.pagePath == pagePath" class="icon-img" mode="aspectFit" :src="item.selectedIconPath"></image>
					<image v-else class="icon-img" mode="aspectFit" :src="item.iconPath"></image>
				</view>
			</view>
			<view class="uni-tabbar__label" :class="{'active': item.pagePath == pagePath}">
				{{item.text}}
			</view>
		</view>
	</view>

</template>

<script>
	export default {
		props: {
			pagePath: String
		},
		data() {
			return {
				page: 'contact',
				showPage: false,
				containerHeight: 400,
				tabbar: [
					//动态切换的菜单，先隐藏，动态插入
					{
						"pagePath": "/pages/user/user",
						"iconPath": "/static/img/user.png",
						"selectedIconPath": "/static/img/user_on.png",
						"text": "我的"
					}
				]
			};
		},
		watch: {
			pagePath: {
				handler(val) {
					console.log('pagePath监听===val', val)
				},
				immediate: true
			}
		},
		mounted() {
			// 根据自己的业务需求判断条件为true，替换即可
			if (true) {
				this.tabbar.splice(0, 0, {
					"pagePath": "/pages/receipt/receiptList",
					"iconPath": "/static/img/receipt.png",
					"selectedIconPath": "/static/img/receipt_on.png",
					"text": "收货"
				}, {
					"pagePath": "/pages/send/sendList",
					"iconPath": "/static/img/n_send.png",
					"selectedIconPath": "/static/img/n_send_on.png",
					"text": "发货"
				}, {
					"pagePath": "/pages/appliance/appliance",
					"iconPath": "/static/apply.png",
					"selectedIconPath": "/static/apply_on.png",
					"text": "应用"
				})
			}
		},
		methods: {
			changeTab(item) {
				this.page = item.pagePath;
				// 使用reLaunch关闭所有的页面，打开新的栏目页面
				uni.reLaunch({
					url: this.page
				});
			},
		}
	}
</script>

<style lang="scss" scoped>
	.uni-tabbar {
		position: fixed;
		bottom: 0;
		left: 0;
		z-index: 999;
		width: 100%;
		display: flex;
		justify-content: space-around;
		height: 98upx;
		padding: 16upx 0;
		box-sizing: border-box;
		border-top: solid 1upx #ccc;
		background-color: #fff;
		box-shadow: 0px 0px 17upx 1upx rgba(206, 206, 206, 0.32);

		.uni-tabbar__item {
			display: block;
			line-height: 24upx;
			font-size: 20upx;
			text-align: center;
			width: 25%;
		}

		.uni-tabbar__icon {
			height: 24px;
			line-height: 24px;
			text-align: center;
		}

		.icon {
			display: inline-block;
		}

		.uni-tabbar__label {
			line-height: 24upx;
			font-size: 24upx;
			color: #999;

			&.active {
				color: #1ca6ec;
			}
		}

		.icon-img {
			height: 24px;
			width: 24px;
		}
	}
</style>

3、全局引入tabBar.vue组件，找到main.js文件，加入一下代码：

import tabBar from “@/components/tabBar.vue”

Vue.component(‘tabBar’, tabBar)

4、在tabBar页面加入

如：/pages/receipt/receiptList 页面，引入：

	<template>
		<view>
			<view class="uni-p-b-98">这里是内容块</view>
			<tabBar :pagePath="'/pages/receipt/receiptList'"></tabBar>
		</view>
	</template>
<!-- 		其中uni-p-b-98是公共样式类名，表示padding-bottom: 98upx; 
		最底部引入自定义组件，pagePath对应当前显示的页面路径，目的是为了让底部栏高亮 -->