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mini-program/pages/order/components/goods-card/index.js

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+Component({
+  options: {
+    multipleSlots: true, // 在组件定义时的选项中启用多slot支持
+    addGlobalClass: true,
+  },
+  intersectionObserverContext: null,
+
+  externalClasses: [
+    'card-class',
+    'title-class',
+    'desc-class',
+    'num-class',
+    'thumb-class',
+    'specs-class',
+    'price-class',
+    'origin-price-class',
+    'price-prefix-class',
+  ],
+
+  relations: {
+    '../order-card/index': {
+      type: 'ancestor',
+      linked(target) {
+        this.parent = target;
+      },
+    },
+  },
+
+  properties: {
+    hidden: {
+      // 设置为null代表不做类型转换
+      type: null,
+      value: false,
+      observer(hidden) {
+        // null就是代表没有设置，没有设置的话不setData，防止祖先组件触发的setHidden操作被覆盖
+        if (hidden !== null) {
+          this.setHidden(!!hidden);
+        }
+      },
+    },
+    id: {
+      type: String,
+      // `goods-card-88888888`
+      // 不能在这里写生成逻辑，如果在这里写，那么假设有多个goods-list时，他们将共享这个值
+      value: '',
+      observer: (id) => {
+        this.genIndependentID(id);
+        if (this.properties.thresholds?.length) {
+          this.createIntersectionObserverHandle();
+        }
+      },
+    },
+    data: {
+      type: Object,
+      observer(goods) {
+        // 有ID的商品才渲染
+        if (!goods) {
+          return;
+        }
+
+        /** 划线价是否有效 */
+        let isValidityLinePrice = true;
+        // 判断一次划线价格是否合理
+        if (
+          goods.originPrice &&
+          goods.price &&
+          goods.originPrice < goods.price
+        ) {
+          isValidityLinePrice = false;
+        }
+
+        // 敲定换行数量默认值
+        if (goods.lineClamp === undefined || goods.lineClamp <= 0) {
+          // tag数组长度 大于0 且 可见
+          // 指定换行为1行
+          if ((goods.tags?.length || 0) > 0 && !goods.hideKey?.tags) {
+            goods.lineClamp = 1;
+          } else {
+            goods.lineClamp = 2;
+          }
+        }
+
+        this.setData({ goods, isValidityLinePrice });
+      },
+    },
+    layout: {
+      type: String,
+      value: 'horizontal',
+    },
+    thumbMode: {
+      type: String,
+      value: 'aspectFill',
+    },
+    thumbWidth: Number,
+    thumbHeight: Number,
+    priceFill: {
+      type: Boolean,
+      value: true,
+    },
+    currency: {
+      type: String,
+      value: '¥',
+    },
+    lazyLoad: {
+      type: Boolean,
+      value: false,
+    },
+    centered: {
+      type: Boolean,
+      value: false,
+    },
+    showCart: {
+      type: Boolean,
+      value: false,
+    },
+    pricePrefix: {
+      type: String,
+      value: '',
+    },
+    cartSize: {
+      type: Number,
+      value: 48,
+    },
+    cartColor: {
+      type: String,
+      value: '#FA550F',
+    },
+    /** 元素可见监控阈值, 数组长度大于0就创建 */
+    thresholds: {
+      type: Array,
+      value: [],
+      observer(current) {
+        if (current && current.length) {
+          this.createIntersectionObserverHandle();
+        } else {
+          this.clearIntersectionObserverHandle();
+        }
+      },
+    },
+    specsIconClassPrefix: {
+      type: String,
+      value: 'wr',
+    },
+    specsIcon: {
+      type: String,
+      value: 'expand_more',
+    },
+    addCartIconClassPrefix: {
+      type: String,
+      value: 'wr',
+    },
+    addCartIcon: {
+      type: String,
+      value: 'cart',
+    },
+  },
+
+  data: {
+    hiddenInData: false,
+    independentID: '',
+    goods: { id: '' },
+    /** 保证划线价格不小于原价，否则不渲染划线价 */
+    isValidityLinePrice: false,
+  },
+
+  lifetimes: {
+    ready() {
+      this.init();
+    },
+    detached() {
+      this.clear();
+    },
+  },
+
+  methods: {
+    clickHandle() {
+      this.triggerEvent('click', { goods: this.data.goods });
+    },
+    clickThumbHandle() {
+      this.triggerEvent('thumb', { goods: this.data.goods });
+    },
+    clickTagHandle(evt) {
+      const { index } = evt.currentTarget.dataset;
+      this.triggerEvent('tag', { goods: this.data.goods, index });
+    },
+    // 加入购物车
+    addCartHandle(e) {
+      const { id } = e.currentTarget;
+      const { id: cardID } = e.currentTarget.dataset;
+      this.triggerEvent('add-cart', {
+        ...e.detail,
+        id,
+        cardID,
+        goods: this.data.goods,
+      });
+    },
+    genIndependentID(id, cb) {
+      let independentID;
+      if (id) {
+        independentID = id;
+      } else {
+        // `goods-card-88888888`
+        independentID = `goods-card-${~~(Math.random() * 10 ** 8)}`;
+      }
+      this.setData({ independentID }, cb);
+    },
+
+    init() {
+      const { thresholds, id, hidden } = this.properties;
+      if (hidden !== null) {
+        this.setHidden(!!hidden);
+      }
+
+      this.genIndependentID(id || '', () => {
+        if (thresholds && thresholds.length) {
+          this.createIntersectionObserverHandle();
+        }
+      });
+    },
+
+    clear() {
+      this.clearIntersectionObserverHandle();
+    },
+
+    setHidden(hidden) {
+      this.setData({ hiddenInData: !!hidden });
+    },
+
+    createIntersectionObserverHandle() {
+      if (this.intersectionObserverContext || !this.data.independentID) {
+        return;
+      }
+
+      this.intersectionObserverContext = wx
+        .createIntersectionObserver(this, {
+          thresholds: this.properties.thresholds,
+        })
+        .relativeToViewport();
+
+      this.intersectionObserverContext.observe(
+        `#${this.data.independentID}`,
+        (res) => {
+          this.intersectionObserverCB(res);
+        },
+      );
+    },
+    intersectionObserverCB(ob) {
+      this.triggerEvent('ob', {
+        goods: this.data.goods,
+        context: this.intersectionObserverContext,
+        ob,
+      });
+    },
+    clearIntersectionObserverHandle() {
+      if (this.intersectionObserverContext) {
+        try {
+          this.intersectionObserverContext.disconnect();
+        } catch (e) {}
+
+        this.intersectionObserverContext = null;
+      }
+    },
+  },
+});