修复bug

src/pages/store/goods/list/index.vue

@@ -934,7 +934,7 @@ export default {
         if (newList.length) {
           util
             .getAllElementTop(classify.map(item => item.dom_id), res =>
-              res.map(item => item.top - res[0].top)
+              res.map(item => (item && res[0] ? item.top - res[0].top : 0))
             )
             .then(res => (this._classifyTopVals = res))
         }
@@ -1375,12 +1375,19 @@ export default {
     },
     // 商品列表滚动监听
     onCateringGoodsListScroll(e) {
-      if (this._disabledScrollFlag) return (this._disabledScrollFlag = false)
+      if (this._disabledScrollFlag) {
+        this._disabledScrollFlag = false
+        return
+      }
       let index = 0
-      this._classifyTopVals.forEach((citem, cIndex) => {
-        if (citem < e.detail.scrollTop) index = cIndex
-      })
-      if (index === this.cateringCurrentClassifyIndex) return
+      if (this._classifyTopVals) {
+        this._classifyTopVals.forEach((citem, cIndex) => {
+          if (citem < e.detail.scrollTop) index = cIndex
+        })
+      }
+      if (index === this.cateringCurrentClassifyIndex) {
+        return
+      }
       this.cateringCurrentClassifyIndex = index
       this.listLeftIntoScroll =
         'left_classify_' + this.cateringClassifyArr[index > 3 ? index - 3 : 0]['id']