更改左右性能优化

pages/order_food/order_food.vue

@@ -327,7 +327,6 @@
 				fixedtrue: true,
 				userInfo: uni.cache.get('userInfo'), //个人信息
 				opacity: false, //是否显示
-				scrollHeight: 1000,
 				scrollTopSize: 0, //距离顶部的高度
 				fillHeight: 0, // 填充高度，用于最后一项低于滚动区域时使用
 				leftArray: [],
@@ -352,6 +351,7 @@
 				salePrice: '', //钱数
 				cartListsdatashow: false, //是否显示购物车
 				showCart: false,
+				lastbottom: '' //元素最低端的距离
 			}
 		},
 		onPageScroll(e) {
@@ -368,17 +368,21 @@
 				return `left-${this.leftIndex? this.leftIndex:0}`;
 			},
 			HeighT() { //手机类型的尺寸    导航栏高度
+				console.log(this.$store.getters.is_BarHeight)
 				return this.$store.getters.is_BarHeight.heightBar + this.$store.getters.is_BarHeight.customBar
 			},
+			scrollHeight() {
+				return this.$store.getters.is_BarHeight.info.windowHeight - this.HeighT
+			}
 		},
 		onReady() {
-			setTimeout(() => {
+			// setTimeout(() => {
-				uni.getSystemInfo({
+			// 	uni.getSystemInfo({
-					success: (data) => {
+			// 		success: (data) => {
-						this.scrollHeight = data.windowHeight
+			// 			this.scrollHeight = data.windowHeight
-					}
+			// 		}
-				})
+			// 	})
-			}, 100);
+			// }, 100);
 		},
 		onLoad(e) {
 			if (e.q) {
@@ -402,7 +406,6 @@
 				scrollTop: 0,
 				duration: 0
 			});
-			console.log(!uni.cache.get('token'))
 			if (!uni.cache.get('token')) {
 				uni.login({
 					provider: 'weixin',
@@ -840,7 +843,6 @@
 						this.setNumber()
 					}
 					this.scrollTopSize = 0
-					this.scrollHeight = 1000
 					this.topArr = []
 					setTimeout(() => {
 						this.getElementTop();
@@ -859,11 +861,14 @@
 						this.scrollTopSize = res.top; //元素距离顶部的距离  
 					})
 				}).then((res) => {
+					console.log(res)
 					let topArr = res.map((item) => {
 						return item.top; /* 减去滚动容器距离顶部的距离 加导航栏高度*/
 					});
-					this.scrollHeight = this.scrollHeight - this.HeighT
+					// this.scrollHeight = this.scrollHeight - this.HeighT
 					this.topArr = topArr;
+					// 获取最后一个元素最低端的盒子到顶点的距离
+					this.lastbottom = res[res.length - 1].bottom;
 					/* 获取最后一项的高度，设置填充高度。判断和填充时做了 +-20 的操作，是为了滚动时更好的定位 */
 					let last = res[res.length - 1].height;
 					if (last - 20 < this.scrollHeight) {
@@ -889,12 +894,11 @@
 							index = i;
 							break;
 						}
+						// const lastElement = this.topArr[this.topArr.length - 1];
 					}
-					const lastElement = this.topArr[this.topArr.length - 1];
 					const currentElement = this.topArr[index];
-					const diff = lastElement - currentElement;
+					const diff = this.lastbottom - currentElement;
-					console.log(diff)
+					if (diff > this.scrollHeight - 200) { //200是固定高度
-					if (diff > this.scrollHeight) {
 						this.leftIndex = (index < 0 ? 0 : index);
 					} else {
 						this.leftIndex = this.leftIndex
@@ -1074,6 +1078,7 @@
 
 					.panelfiveitemsex {
 						margin-top: 32rpx;
+
 						.panelfiveitemsex_oen {
 							text:nth-child(1) {
 								font-family: Source Han Sans CN, Source Han Sans CN;