首先设置footer 利用v-if v-else加上选择器  进行条件置换  在footer内部样式里面设置图片大小背景即可

html代码

	<view class="" @click="topage2">
					<view class="foot_item1" v-if="page_id==1">
					<image class="foot_item1_image" src="../static/pc2.png" mode="">image>
					<view class="foot_item1_text" :class="{'red' :page_id==1}">
						首页
					view>
				view>
				<view class="foot_item1" v-else @click="page_to(1)" >
					<image class="foot_item1_image" src="../static/pc2_1.png" mode="">image>
					<view class="foot_item1_text" :class="{'red' :page_color==1}">
						首页
					view>
				view>
				view>
				
				
				<view class="" @click="topage2">
					<view class="foot_item2" v-if="page_id==2">
						<image class="foot_item1_image" src="../static/pc8_1.png" mode="">image>
						<view class="foot_item1_text">
							在线学习
						view>
					view>
					<view class="foot_item2" v-else  @click="page_to(2)">
						<image class="foot_item1_image" src="../static/pc8.png" mode="">image>
						<view class="foot_item1_text">
							在线学习
						view>
					view>
				view>
				
				
				<view class="foot_item3">
					<image class="foot_item1_image1" @click="page_to(3)" src="../static/pc4.png" mode="">image>
				view>
				
				<view class="" @click="topage3">
					<view class="foot_item4" v-if="page_id==4">
					<image class="foot_item1_image" src="../static/pc9_1.png" mode="">image>
					<view class="foot_item1_text">
						培训中心
					view>
				view>
				<view class="foot_item4" v-else @click="page_to(4)">
					<image class="foot_item1_image" src="../static/pc9.png" mode="">image>
					<view class="foot_item1_text">
						培训中心
					view>
				view>
				view>
				
				
				<view class="" @click="topage4">
					<view class="foot_item5" v-if="page_id==5" >
					<image class="foot_item1_image" src="../static/pc10_1.png" mode="">image>
					<view class="foot_item1_text">
						我的
					view>
				view>
				<view class="foot_item5" v-else @click="page_to(5)">
					<image class="foot_item1_image" src="../static/pc10.png" mode="">image>
					<view class="foot_item1_text">
						我的
					view>
				view>
				view>
				
				
			view>

js部分

page_to(index){
				localStorage.setItem('page_id',index)
				localStorage.setItem('page_color',index)
				if(index==1){
					uni.navigateTo({
						url:""
					})
					this.page_id=index
					this.page_color=index
				}else if(index==2){
					uni.navigateTo({
						url:""
					})
					this.page_id=index
					this.page_color=index
				}else if(index==3){
					uni.navigateTo({
						url:""
					})
					this.page_id=index
					this.page_color=index
				}else if(index==4){
					uni.navigateTo({
						url:""
					})
					this.page_id=index
					this.page_color=index
				}else if(index==5){
					uni.navigateTo({
						url:""
					})
					this.page_id=index
					this.page_color=index
				}
			}
		}