上传代码

uniapp04/unpackage/dist/dev/mp-alipay/pages/forums/forums.axml

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+<view class="cart-page"><view a:for="{{a}}" a:for-item="item" a:key="d"><view>{{item.a}} - {{item.b}}元</view><button onTap="{{item.c}}">+</button></view><view a:if="{{b}}"><view>购物车中的商品：</view><view a:for="{{c}}" a:for-item="cartItem" a:key="d">{{cartItem.a}} - {{cartItem.b}}元 <button onTap="{{cartItem.c}}">-</button></view></view></view>

uniapp04/unpackage/dist/dev/mp-alipay/pages/forums/forums.js

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+"use strict";
+const common_vendor = require("../../common/vendor.js");
+const _sfc_main = {
+  data() {
+    return {
+      menuItems: [
+        { name: "牛肉面", price: 18 },
+        { name: "炒饭", price: 15 }
+      ],
+      cart: []
+    };
+  },
+  methods: {
+    addToCart(item) {
+      this.cart.push({ ...item });
+    },
+    removeFromCart(index) {
+      this.cart.splice(index, 1);
+    }
+  }
+};
+function _sfc_render(_ctx, _cache, $props, $setup, $data, $options) {
+  return common_vendor.e({
+    a: common_vendor.f($data.menuItems, (item, index, i0) => {
+      return {
+        a: common_vendor.t(item.name),
+        b: common_vendor.t(item.price),
+        c: common_vendor.o(($event) => $options.addToCart(item)),
+        d: index
+      };
+    }),
+    b: $data.cart.length > 0
+  }, $data.cart.length > 0 ? {
+    c: common_vendor.f($data.cart, (cartItem, cartIndex, i0) => {
+      return {
+        a: common_vendor.t(cartItem.name),
+        b: common_vendor.t(cartItem.price),
+        c: common_vendor.o(($event) => $options.removeFromCart(cartIndex)),
+        d: cartIndex
+      };
+    })
+  } : {});
+}
+const MiniProgramPage = /* @__PURE__ */ common_vendor._export_sfc(_sfc_main, [["render", _sfc_render]]);
+my.createPage(MiniProgramPage);

uniapp04/unpackage/dist/dev/mp-alipay/pages/forums/forums.json

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+{
+  "defaultTitle": "学生中心",
+  "pullRefresh": false,
+  "titleBarColor": "#4095e5",
+  "usingComponents": {}
+}