chore:切换左侧一级分类时，右侧会自动选中第一个二级分类按钮（如"离型纸"）

如果用户之前点击过某个二级分类（如"离型膜"），切换一级分类后会自动选中同名的二级分类

components-diy/diy-category-item.vue

@@ -323,6 +323,10 @@ export default {
 		isList: {
 			type: Boolean,
 			default: false
+		},
+		lastSecondCategoryName: {
+			type: String,
+			default: ''
 		}
 	},
 	mixins: [DiyMinx],
@@ -353,9 +357,16 @@ export default {
 		if (this.index == this.select && this.pageIndex == 0) this.getGoodsList();
 		this.loadType = this.value.goodsLevel == 1 && this.value.loadType == 'all' ? 'all' : 'part';
 		if (this.index == this.select && parseInt(this.value.level) == 2 && this.category.child_list && this.category.child_list.length > 0) {
-			this.selectedSecondCategory = this.category.child_list[0].category_id;
+			let targetCategory = null;
+			if (this.lastSecondCategoryName) {
+				targetCategory = this.category.child_list.find(item => item.category_name === this.lastSecondCategoryName);
+			}
+			if (!targetCategory) {
+				targetCategory = this.category.child_list[0];
+			}
+			this.selectedSecondCategory = targetCategory.category_id;
 			this.secondCategoryGoodsList = [];
-			this.getSecondCategoryGoods(this.category.child_list[0].category_id);
+			this.getSecondCategoryGoods(targetCategory.category_id);
 		}
 	},
 	mounted() {
@@ -367,9 +378,16 @@ export default {
 				}).exec();
 		}, 1000);
 		if (parseInt(this.value.level) == 2 && this.category.child_list && this.category.child_list.length > 0) {
-			this.selectedSecondCategory = this.category.child_list[0].category_id;
+			let targetCategory = null;
+			if (this.lastSecondCategoryName) {
+				targetCategory = this.category.child_list.find(item => item.category_name === this.lastSecondCategoryName);
+			}
+			if (!targetCategory) {
+				targetCategory = this.category.child_list[0];
+			}
+			this.selectedSecondCategory = targetCategory.category_id;
 			this.secondCategoryGoodsList = [];
-			this.getSecondCategoryGoods(this.category.child_list[0].category_id);
+			this.getSecondCategoryGoods(targetCategory.category_id);
 		}
 	},
 	watch: {
@@ -400,9 +418,16 @@ export default {
 				this.scrollTop = -1;
 			}
 			if (parseInt(this.value.level) == 2 && this.category.child_list && this.category.child_list.length > 0) {
-				this.selectedSecondCategory = this.category.child_list[0].category_id;
+				let targetCategory = null;
+				if (this.lastSecondCategoryName) {
+					targetCategory = this.category.child_list.find(item => item.category_name === this.lastSecondCategoryName);
+				}
+				if (!targetCategory) {
+					targetCategory = this.category.child_list[0];
+				}
+				this.selectedSecondCategory = targetCategory.category_id;
 				this.secondCategoryGoodsList = [];
-				this.getSecondCategoryGoods(this.category.child_list[0].category_id);
+				this.getSecondCategoryGoods(targetCategory.category_id);
 			}
 		},
 		'globalStoreInfo.store_id': {
@@ -791,6 +816,7 @@ export default {
 				this.selectedSecondCategory = category.category_id;
 				this.secondCategoryGoodsList = [];
 				this.getSecondCategoryGoods(category.category_id);
+				this.$emit('saveSecondCategory', category.category_name);
 			}
 		},
 		getSecondCategoryGoods(categoryId) {

components-diy/diy-category.vue

@@ -101,8 +101,9 @@
 							:id="'category-' + index" v-if="select == index">
 							<diy-category-item :category="item" :value="value" ref="categoryItem" :index="index"
 								:select="select" :oneCategorySelect="oneCategorySelect" :isList="isList"
+								:lastSecondCategoryName="lastSecondCategoryName"
 								@tologin="toLogin" @selectsku="selectSku($event, index)" @addCart="addCartPoint"
-								@loadfinish="getHeightArea"></diy-category-item>
+								@loadfinish="getHeightArea" @saveSecondCategory="saveSecondCategoryName"></diy-category-item>
 						</view>
 						<view class="end-tips" ref="endTips" :style="{ opacity: endTips }">{{ $lang('components-diy.diy-category.reachedBottom') }}</view>
 					</scroll-view>
@@ -194,7 +195,8 @@ export default {
 			loadType: '',
 			templateFourData: [],
 			isList: false,
-			lang: uni.getStorageSync("lang")//en-us 英文
+			lang: uni.getStorageSync("lang"),
+			lastSecondCategoryName: ''
 		};
 	},
 	created() {
@@ -373,9 +375,11 @@ export default {
 			if (index >= this.categoryTree.length) return;
 			this.select = index;
 			this.categoryId = 'category-' + index;
-			// 阻止切换分类之后滚动事件也立即执行
 			this.scrollLock = true;
 		},
+		saveSecondCategoryName(name) {
+			this.lastSecondCategoryName = name;
+		},
 		touchStart() {
 			this.scrollLock = false;
 		},