部分

pages/shopping/shopping.js

@@ -116,7 +116,20 @@ Page({
     onReachBottom: function () {
 
     },
+gai(a){
+    console.log(a)
+    for(let i in this.data.list){
+        if(this.data.list[i].id == a.detail.id){
+            let text = `list[${i}].goods_num`
+            this.setData({
+                [text]:a.detail.num
+            })
+            console.log(123)
 
+        }
+    }
+    this.num()
+},
     /**
      * 用户点击右上角分享
      */
@@ -129,7 +142,7 @@ Page({
         for (let i in this.data.select) {
             console.log(i)
             if (this.data.select[i]) {
-                num += parseFloat(this.data.list[i].goods_price) * 100
+                num += parseFloat(this.data.list[i].goods_price) * 100 * this.data.list[i].goods_num
                 sel++
             }
         }

pages/shopping/shopping.wxml

@@ -1,6 +1,6 @@
 <view class="shopping">
    <view class="item" wx:for="{{list}}" wx:for-index="j" wx:key="{{j}}">
-      <shopping-item shopname="{{item.goods_name}}" shopdesc="{{item.spec_key_name||'默认规格'}}" price="{{item.goods_price}}" pic="{{item.image}}" num="{{item.goods_num}}" gid="{{item.id}}" index="{{j}}" select="{{select[j]}}" bindsel="sel"></shopping-item>
+      <shopping-item bindgai="gai" shopname="{{item.goods_name}}" shopdesc="{{item.spec_key_name||'默认规格'}}" price="{{item.goods_price}}" pic="{{item.image}}" num="{{item.goods_num}}" gid="{{item.id}}" index="{{j}}" select="{{select[j]}}" bindsel="sel"></shopping-item>
    </view>
    <!-- <view class="item">
       <shopping-item shopname="J`adore - Dior" shopdesc="30支   1.30kg" price="61.78"></shopping-item>