我的订单点击跳转订单详情页；订单详情页展示订单总金额；立即下单可以选择商品数量

weixin-miniprogram/pages/shop/goodDetail.js

@@ -10,7 +10,9 @@ Page({
    */
   data: {
     goodId: -1,
-    goodinfo: {}
+    goodinfo: {},
+
+    buyGoodCount: 1,
   },
 
   /**
@@ -74,22 +76,66 @@ Page({
 
   },
 
+
+  bindCountInput(e) {
+    console.log("e", e)
+    console.log("e.detail.value", e.detail.value)
+
+    let regexp = /^[0-9]+$/.exec(e.detail.value)
+    let buyGoodCountNum = Number(e.detail.value)
+    if (!regexp || isNaN(buyGoodCountNum) || buyGoodCountNum < 1) {
+      wx.showToast({
+        title: '输入无效',
+        icon: "error",
+      })
+      this.setData({
+        buyGoodCount: this.data.buyGoodCount,
+      })
+      return
+    }
+
+    this.setData({
+      buyGoodCount: buyGoodCountNum,
+    })
+  },
+  btnAddCount() {
+    this.setData({
+      buyGoodCount: this.data.buyGoodCount + 1,
+    })
+  },
+  btnSubtractCount() {
+    this.setData({
+      buyGoodCount: this.data.buyGoodCount - 1,
+    })
+  },
+
+
   // 立即下单
   btnBuyTap() {
     (async () => {
       // 创建订单
       let orderList = [{
         goodId: this.data.goodId,
-        count: 1,
+        count: this.data.buyGoodCount,
       }]
       let orderId = await orderService.createOrder(orderList)
       console.log("orderId", orderId)
 
-      // 跳转订单查看页面（携带订单号）
-      wx.navigateTo({
-        // url: "/pages/scan/entrance?a=1"
-        url: "/pages/shop/orderDetail?orderId=" + orderId
-      })
+      if (!orderId) {
+        wx.showModal({
+          title: '出错了',
+          content: '创建订单失败，请重试',
+          showCancel: false,
+          complete: (res) => {
+          }
+        })
+      } else {
+        // 跳转订单查看页面（携带订单号）
+        wx.navigateTo({
+          // url: "/pages/scan/entrance?a=1"
+          url: "/pages/shop/orderDetail?orderId=" + orderId
+        })
+      }
     })();
   },