才购物车二次进来

pages/order_food/order_food.vue

@@ -483,6 +483,9 @@
 					if (this.cartLists && this.cartLists.data && this.cartLists.data.length >= 0) {
 						this.setNumber()
 					}
+					this.scrollTopSize = 0
+					this.scrollHeight = 1000
+					this.topArr = []
 					setTimeout(() => {
 						this.getElementTop();
 					}, 100);
@@ -833,6 +836,7 @@
 
 			/* 获取元素顶部信息 */
 			getElementTop() {
+
 				new Promise((resolve, reject) => {
 					let view = uni.createSelectorQuery().selectAll('.main-item');
 					view.boundingClientRect(async data => {
@@ -874,14 +878,14 @@
 						}
 					}
 					const lastElement = this.topArr[this.topArr.length - 1];
-					const currentElement = this.topArr[this.leftIndex];
+					const currentElement = this.topArr[index];
 					const diff = lastElement - currentElement;
 					console.log(diff)
-					// if (diff > this.scrollHeight) {
-					this.leftIndex = (index < 0 ? 0 : index);
-					// } else {
-					// 	this.leftIndex = this.leftIndex
-					// }
+					if (diff > this.scrollHeight) {
+						this.leftIndex = (index < 0 ? 0 : index);
+					} else {
+						this.leftIndex = this.leftIndex
+					}
 				}
 			},
 			/* 左侧导航点击 */
@@ -890,9 +894,7 @@
 					scrollTop: this.topArr[index] - this.HeighT,
 					duration: 0
 				});
-				setTimeout(() => {
-					this.leftIndex = index
-				}, 500)
+				this.leftIndex = index
 			}
 		}
 	}