<template>
	<view class="page-body" :style="'height:' + height + 'px'">
		<scroll-view class="nav-left" scroll-y :style="'height:' + height + 'px'" :scroll-top="scrollLeftTop" scroll-with-animation>
			<view class="nav-left-item" @click="categoryClickMain(index)" :key="index" :class="index == categoryActive ? 'active' : ''" v-for="(item, index) in classifyData">
				{{ item.name }}
			</view>
		</scroll-view>
		<scroll-view 
		class="nav-right" 
		scroll-y 
		:scroll-top="scrollTop" 
		@scroll="scroll" 
		:style="'height:' + height + 'px'" 
		scroll-with-animation
		>
			<view v-for="(foods, index) in classifyData" :key="index" class="box">
				<view>{{foods.name}}</view>
				<view :id="i == 0 ? 'first' : ''" class="nav-right-item" v-for="(item, i) in foods.foods" :key="i" @click="cart(item.name)">
					<image src="../../static/logo.png" />
					<view>{{ item.name }}</view>
				</view>
			</view>
		</scroll-view>
	</view>
</template>

<script>
import classifyData from '../../common/classify.data.js';
export default {
	data() {
		return {
			name: 'wkiwi',
			height: 0,
			categoryActive: 0,
			scrollTop: 0,
			scrollLeftTop: 0,
			// scrollHeight: 0,
			classifyData: classifyData,
			arr: [0, 584, 1168, 1752, 2336, 2805, 3274, 3858, 4442, 4911, 5380, 5734, 6203, 6672, 7017], //初始值，后边计算会根据手机适配覆盖
			leftItemHeight: 51, //49行会计算出新值进行覆盖
			navLeftHeight: 0, //左边scroll-view 内层nav的总高度
			diff: 0, //左边scroll-view 内层nav的总高度与视口之差
			tabBarHeight: 0 //如果此页面为Tab页面，自己改变高度值,,一般tab高度为51
		};
	},
	created() {
		//如果你的分类数据为后台异步获取请	将下方代码放置你的数据回调中
		// this.$nextTick(()=>{
		// 	this.getHeightList();
		// })
	},
	onLoad: function() {
		this.height = uni.getSystemInfoSync().windowHeight - this.tabBarHeight;
	},
	onReady() {
		this.getHeightList();
	},
	methods: {
		getHeightList() {
			let _this = this;
			let selectorQuery = uni.createSelectorQuery();
			selectorQuery.selectAll('.nav-left-item').boundingClientRect(function(rects) {
				_this.leftItemHeight = rects[0].height;
				_this.navLeftHeight = _this.leftItemHeight * classifyData.length;
				_this.diff = _this.navLeftHeight - _this.height;
			});
			selectorQuery
				.selectAll('.box')
				.boundingClientRect(function(rects) {
					let arr = [0];
					let top = 0;
					rects.forEach(function(rect) {
						// 					rect.id      // 节点的ID
						// 					rect.dataset // 节点的dataset
						// 					rect.left    // 节点的左边界坐标
						// 					rect.right   // 节点的右边界坐标
						// 					rect.top     // 节点的上边界坐标
						// 					rect.bottom  // 节点的下边界坐标
						// 					rect.width   // 节点的宽度
						// 					rect.height  // 节点的高度
						top += rect.height;
						arr.push(top);
					});
					console.log(arr);
					_this.arr = arr;
				})
				.exec();
		},
		scroll(e) {
			let _this = this;
			if (this.timeoutId) {
				clearTimeout(this.timeoutId);
			}
			this.timeoutId = setTimeout(function() {
				//节流
				_this.scrollHeight = e.detail.scrollTop + 1 + _this.height / 2;
				//+1不要删除，解决最后一项某种情况下翻到底部，左边按钮并不会切换至最后一个
				//若想使切换参考线为屏幕顶部请删除 _this.height/2
				for (let i = 0; i < _this.arr.length; i++) {
					let height1 = _this.arr[i];
					let height2 = _this.arr[i + 1];
					if (!height2 || (_this.scrollHeight >= height1 && _this.scrollHeight < height2)) {
						_this.categoryActive = i;
						_this.diff > 0 && (_this.scrollLeftTop = Math.round((_this.categoryActive * _this.diff) / (classifyData.length - 1)));
						return false;
					}
				}
				_this.categoryActive = 0;
				_this.timeoutId = undefined;
			}, 10);
		},
		categoryClickMain(index) {
			this.categoryActive = index;
			this.scrollTop == this.arr[index] ? (this.scrollTop = this.scrollTop + 1) : (this.scrollTop = this.arr[index]); //防止两次相等造成点击不触发滚动时间
		},
		cart: function(text) {
			uni.showToast({
				title: text,
				icon: 'none'
			});
		}
	},
	components: {}
};
</script>

<style>
.page-body {
	display: flex;
	background: #fff;
	overflow: hidden;
}

.nav {
	display: flex;
	width: 100%;
}

.nav-left {
	width: 25%;
	background: #fafafa;
}

.nav-left-item {
	height: 100upx;
	border-right: solid 1px #f1f1f1;
	border-bottom: solid 1px #f1f1f1;
	font-size: 30upx;
	display: flex;
	align-items: center;
	justify-content: center;
}
.nav-left-item:last-child {
	border-bottom: none;
}
.nav-right {
	width: 75%;
}
.box {
	display: block;
	overflow: hidden;
	border-bottom: 20upx solid #f3f3f3;
	/* min-height: 100vh; */
	/*若您的子分类过少想使得每个子分类占满屏请放开上边注视 */
}
.box:last-child {
	border: none;
	min-height: 100vh;
}
.nav-right-item {
	width: 28%;
	height: 220upx;
	float: left;
	text-align: center;
	padding: 11upx;
	font-size: 28upx;
	background: #fff;
}

.nav-right-item image {
	width: 150upx;
	height: 150upx;
}

.active {
	color: #ff80ab;
	background: #fff;
	border-right: 0;
}
::-webkit-scrollbar {
	/*取消小程序的默认导航条样式*/
	width: 0;
	height: 0;
	color: transparent;
}
</style>

引用的 JS文件：

export default [{
		"name": "女装",
		"foods": [{
				"name": "A字裙",
				"key": "A字裙",
				"icon": "http://img.kiwifruits.cn/classify/1/1.jpg",
				"cat": 10
			},
			{
				"name": "T恤",
				"key": "T恤",
				"icon": "http://img.kiwifruits.cn/classify/1/2.jpg",
				"cat": 10
			},
			{
				"name": "半身裙",
				"key": "半身裙",
				"icon": "http://img.kiwifruits.cn/classify/1/3.jpg",
				"cat": 10
			},
			{
				"name": "衬衫",
				"key": "衬衫",
				"icon": "http://img.kiwifruits.cn/classify/1/4.jpg",
				"cat": 10
			},
			{
				"name": "短裙",
				"key": "短裙",
				"icon": "http://img.kiwifruits.cn/classify/1/5.jpg",
				"cat": 10
			},
			{
				"name": "阔腿裤",
				"key": "阔腿裤",
				"icon": "http://img.kiwifruits.cn/classify/1/6.jpg",
				"cat": 10
			},
			{
				"name": "连衣裙",
				"key": "连衣裙",
				"icon": "http://img.kiwifruits.cn/classify/1/7.jpg",
				"cat": 10
			},
			{
				"name": "妈妈装",
				"key": "妈妈装",
				"icon": "http://img.kiwifruits.cn/classify/1/8.jpg",
				"cat": 10
			},
			{
				"name": "牛仔裤",
				"key": "牛仔裤",
				"icon": "http://img.kiwifruits.cn/classify/1/9.jpg",
				"cat": 10
			},
			{
				"name": "情侣装",
				"key": "情侣装",
				"icon": "http://img.kiwifruits.cn/classify/1/10.jpg",
				"cat": 10
			},
			{
				"name": "休闲裤",
				"key": "休闲裤",
				"icon": "http://img.kiwifruits.cn/classify/1/11.jpg",
				"cat": 10
			},
			{
				"name": "雪纺衫",
				"key": "雪纺衫",
				"icon": "http://img.kiwifruits.cn/classify/1/12.jpg",
				"cat": 10
			},
			{
				"name": "防晒衣",
				"key": "防晒衣",
				"icon": "http://img.kiwifruits.cn/classify/1/13.jpg",
				"cat": 10
			},
			{
				"name": "礼服/婚纱",
				"key": "礼服婚纱",
				"icon": "http://img.kiwifruits.cn/classify/1/14.jpg",
				"cat": 10
			}
		]
	},
	{
		"name": "美食",
		"foods": [{
				"name": "火锅",
				"key": "火锅",
				"icon": "http://img.kiwifruits.cn/classify/2/1.jpg",
				"cat": 6
			},
			{
				"name": "糕点饼干",
				"key": "糕点饼干",
				"icon": "http://img.kiwifruits.cn/classify/2/2.jpg",
				"cat": 6
			},
			{
				"name": "坚果果干",
				"key": "坚果果干",
				"icon": "http://img.kiwifruits.cn/classify/2/3.jpg",
				"cat": 6
			},
			{
				"name": "酒类",
				"key": "酒类",
				"icon": "http://img.kiwifruits.cn/classify/2/4.jpg",
				"cat": 6
			},
			{
				"name": "辣条",
				"key": "辣条",
				"icon": "http://img.kiwifruits.cn/classify/2/5.jpg",
				"cat": 6
			},
			{
				"name": "大礼包",
				"key": "大礼包",
				"icon": "http://img.kiwifruits.cn/classify/2/6.jpg",
				"cat": 6
			},
			{
				"name": "精品茗茶",
				"key": "茶",
				"icon": "http://img.kiwifruits.cn/classify/2/7.jpg",
				"cat": 6
			},
			{
				"name": "休闲食品",
				"key": "休闲食品",
				"icon": "http://img.kiwifruits.cn/classify/2/8.jpg",
				"cat": 6
			},
			{
				"name": "糖果巧克力",
				"key": "糖果巧克力",
				"icon": "http://img.kiwifruits.cn/classify/2/9.jpg",
				"cat": 6
			},
			{
				"name": "方便速食",
				"key": "方便速食",
				"icon": "http://img.kiwifruits.cn/classify/2/10.jpg",
				"cat": 6
			},
			{
				"name": "营养代餐",
				"key": "营养代餐",
				"icon": "http://img.kiwifruits.cn/classify/2/11.jpg",
				"cat": 6
			},
			{
				"name": "粮油副食",
				"key": "粮油",
				"icon": "http://img.kiwifruits.cn/classify/2/12.jpg",
				"cat": 6
			},
			{
				"name": "生鲜水果",
				"key": "水果",
				"icon": "http://img.kiwifruits.cn/classify/2/13.jpg",
				"cat": 6
			},
			{
				"name": "饮品",
				"key": "饮品",
				"icon": "http://img.kiwifruits.cn/classify/2/14.jpg",
				"cat": 6
			}
		]
	},
	{
		"name": "美妆",
		"foods": [{
				"name": "化妆刷",
				"key": "化妆刷",
				"icon": "http://img.kiwifruits.cn/classify/3/1.jpg",
				"cat": 3
			},
			{
				"name": "粉底",
				"key": "粉底",
				"icon": "http://img.kiwifruits.cn/classify/3/2.jpg",
				"cat": 3
			},
			{
				"name": "洗发护发",
				"key": "洗发护发",
				"icon": "http://img.kiwifruits.cn/classify/3/3.jpg",
				"cat": 3
			},
			{
				"name": "美容工具",
				"key": "美容工具",
				"icon": "http://img.kiwifruits.cn/classify/3/4.jpg",
				"cat": 3
			},
			{
				"name": "眼部护理",
				"key": "眼部护理",
				"icon": "http://img.kiwifruits.cn/classify/3/5.jpg",
				"cat": 3
			},
			{
				"name": "眉妆",
				"key": "眉妆",
				"icon": "http://img.kiwifruits.cn/classify/3/6.jpg",
				"cat": 3
			},
			{
				"name": "卸妆品",
				"key": "卸妆品",
				"icon": "http://img.kiwifruits.cn/classify/3/7.jpg",
				"cat": 3
			},
			{
				"name": "基础护肤",
				"key": "基础护肤",
				"icon": "http://img.kiwifruits.cn/classify/3/8.jpg",
				"cat": 3
			},
			{
				"name": "眼妆",
				"key": "眼妆",
				"icon": "http://img.kiwifruits.cn/classify/3/9.jpg",
				"cat": 3
			},
			{
				"name": "唇妆",
				"key": "唇妆",
				"icon": "http://img.kiwifruits.cn/classify/3/10.jpg",
				"cat": 3
			},
			{
				"name": "面膜",
				"key": "面膜",
				"icon": "http://img.kiwifruits.cn/classify/3/11.jpg",
				"cat": 3
			},
			{
				"name": "沐浴用品",
				"key": "沐浴用品",
				"icon": "http://img.kiwifruits.cn/classify/3/12.jpg",
				"cat": 3
			},
			{
				"name": "护肤套装",
				"key": "护肤套装",
				"icon": "http://img.kiwifruits.cn/classify/3/13.jpg",
				"cat": 3
			},
			{
				"name": "防晒品",
				"key": "防晒品",
				"icon": "http://img.kiwifruits.cn/classify/3/14.jpg",
				"cat": 3
			},
			{
				"name": "美甲",
				"key": "美甲",
				"icon": "http://img.kiwifruits.cn/classify/3/15.jpg",
				"cat": 3
			}

		]
	},
	{
		"name": "居家日用",
		"foods": [{
				"name": "垃圾袋",
				"key": "垃圾袋",
				"icon": "http://img.kiwifruits.cn/classify/4/1.jpg",
				"cat": 4
			},
			{
				"name": "纸巾",
				"key": "纸巾",
				"icon": "http://img.kiwifruits.cn/classify/4/2.jpg",
				"cat": 4
			},
			{
				"name": "驱蚊用品",
				"key": "驱蚊用品",
				"icon": "http://img.kiwifruits.cn/classify/4/3.jpg",
				"cat": 4
			},
			{
				"name": "收纳神器",
				"key": "收纳神器",
				"icon": "http://img.kiwifruits.cn/classify/4/4.jpg",
				"cat": 4
			},
			{
				"name": "厨房用品",
				"key": "厨房用品",
				"icon": "http://img.kiwifruits.cn/classify/4/5.jpg",
				"cat": 4
			},
			{
				"name": "厨房烹饪",
				"key": "烹饪",
				"icon": "http://img.kiwifruits.cn/classify/4/6.jpg",
				"cat": 4
			},
			{
				"name": "衣物晾晒",
				"key": "衣物晾晒",
				"icon": "http://img.kiwifruits.cn/classify/4/7.jpg",
				"cat": 4
			},
			{
				"name": "衣物护理",
				"key": "衣物护理",
				"icon": "http://img.kiwifruits.cn/classify/4/8.jpg",
				"cat": 4
			},
			{
				"name": "宠物用品",
				"key": "宠物用品",
				"icon": "http://img.kiwifruits.cn/classify/4/9.jpg",
				"cat": 4
			},
			{
				"name": "医药保健",
				"key": "医药",
				"icon": "http://img.kiwifruits.cn/classify/4/10.jpg",
				"cat": 4
			},
			{
				"name": "日用百货",
				"key": "百货",
				"icon": "http://img.kiwifruits.cn/classify/4/11.jpg",
				"cat": 4
			},
			{
				"name": "清洁用品",
				"key": "清洁",
				"icon": "http://img.kiwifruits.cn/classify/4/12.jpg",
				"cat": 4
			},
			{
				"name": "绿植园艺",
				"key": "绿植",
				"icon": "http://img.kiwifruits.cn/classify/4/13.jpg",
				"cat": 4
			}
		]
	},
	{
		"name": "男装",
		"foods": [{
				"name": "爸爸装",
				"key": "爸爸装",
				"icon": "http://img.kiwifruits.cn/classify/5/1.jpg",
				"cat": 12
			},
			{
				"name": "牛仔裤",
				"key": "牛仔裤",
				"icon": "http://img.kiwifruits.cn/classify/5/2.jpg",
				"cat": 12
			},
			{
				"name": "衬衫",
				"key": "衬衫",
				"icon": "http://img.kiwifruits.cn/classify/5/3.jpg",
				"cat": 12
			},
			{
				"name": "休闲裤",
				"key": "休闲裤",
				"icon": "http://img.kiwifruits.cn/classify/5/4.jpg",
				"cat": 12
			},
			{
				"name": "外套",
				"key": "外套",
				"icon": "http://img.kiwifruits.cn/classify/5/5.jpg",
				"cat": 12
			},
			{
				"name": "T恤",
				"key": "T恤",
				"icon": "http://img.kiwifruits.cn/classify/5/6.jpg",
				"cat": 12
			},
			{
				"name": "套装",
				"key": "套装",
				"icon": "http://img.kiwifruits.cn/classify/5/7.jpg",
				"cat": 12
			},
			{
				"name": "运动裤",
				"key": "运动裤",
				"icon": "http://img.kiwifruits.cn/classify/5/8.jpg",
				"cat": 12
			},
			{
				"name": "马甲/背心",
				"key": "马甲背心",
				"icon": "http://img.kiwifruits.cn/classify/5/9.jpg",
				"cat": 12
			},
			{
				"name": "POLO衫",
				"key": "POLO衫",
				"icon": "http://img.kiwifruits.cn/classify/5/10.jpg",
				"cat": 12
			},
			{
				"name": "商务装",
				"key": "商务装",
				"icon": "http://img.kiwifruits.cn/classify/5/11.jpg",
				"cat": 12
			}
		]
	},
	{
		"name": "鞋品",
		"foods": [{
				"name": "单鞋",
				"key": "单鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/1.jpg",
				"cat": 5
			},
			{
				"name": "皮鞋",
				"key": "皮鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/2.jpg",
				"cat": 5
			},
			{
				"name": "帆布鞋",
				"key": "帆布鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/3.jpg",
				"cat": 5
			},
			{
				"name": "北京老布鞋",
				"key": "北京老布鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/4.jpg",
				"cat": 5
			},
			{
				"name": "运动鞋",
				"key": "运动鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/5.jpg",
				"cat": 5
			},
			{
				"name": "拖鞋",
				"key": "拖鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/6.jpg",
				"cat": 5
			},
			{
				"name": "凉鞋",
				"key": "凉鞋",
				"icon": "http://img.kiwifruits.cn/classify/6/7.jpg",
				"cat": 5
			},
			{
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]