卖防御

优点是库存和订单的强一致性商品不会卖超但是可能导致恶意下单影响正常流程支付减库存

优点是避免恶意下单支付和库存强一致性但是可能出现订单无法支付商品库存不足等问题。

预扣库存

预扣库存是指用户请求之后预扣库存生成订单在时效内支付否则订单失效库存还原代码itshujia.com

或者wx搜《IT书架》

商品秒杀详情页面页面该商品秒杀时间未到则上方进行提醒秒杀商品倒计时并且立即抢购禁用按钮置灰

商品秒杀时间开始则把立即秒杀按钮禁用状态改为可以点击点击立即秒杀按钮要考虑页面防抖不能重复在同一秒中重复发起N次网络请求

四、小程序部分代码展示

image{{goods.goods.goods_image}}

title{{goods.goods.goods_name}}view价格{{goods.goods.goods_price}}/viewview!--

button

}}立即秒杀/l-button/view/l-card小程序js代码

pages/goods_detail/goods_detail.js

import

{goods:{},expire_time:0,btn_disable:false},/***

function

e.goods_id;this.getGoodsDetail(goods_id)},//获取商品详情getGoodsDetail(goods_id){var

token

wx.getStorageSync(token)wx.request({url:

http://www.zfw.com/api/v1/goods_detail?goods_idgoods_id,header:

{Authorization:

res.data.data.start_time-now_time;this.setData({goods:res.data.data,expire_time})if(expire_time

0){this.setData({btn_disable:true})}console.log(this.data.goods)}})},//立即抢购

debounce此方法是引入的util工具类的页面防抖函数buyGoods:debounce(function

(e)

e[0].currentTarget.dataset.goods_idvar

token

wx.getStorageSync(token)wx.request({url:

http://www.zfw.com/api/v1/snap_up,header:

{Authorization:

${token}},method:POST,data:{goods_id},success:

res

(!code.startsWith(2)){wx.showToast({title:

异常,icon:1})}if(res.data.errorCode

/pages/order/order,})}else{wx.showToast({title:

res.data.msg,})}console.log(res.data)}})}),changeBtn(){this.setData({btn_disable:false})}

{usingComponents:

{l-card:/miniprogram_npm/lin-ui/card,l-button:/miniprogram_npm/lin-ui/button,l-countdown:/miniprogram_npm/lin-ui/countdown}

}五、后台业务逻辑

App\Http\Controllers\Controller;

use

Illuminate\Support\Facades\Cache;

use

Illuminate\Support\Facades\Redis;

use

ActivityGoods::with([goods])-get();return

data

ActivityGoods::with([goods])-where(goods_id,$goods_id)-first();return

data

syncStock(){//查出所有参与秒杀活动列表$result

ActivityGoods::with([goods])-get()-toArray();//进行把参与秒杀的商品写入到数据库foreach

($result

activity_goods_.$val[goods_id];for

($i0;

,$request-header(authorization))[1];//进行查看$userInfo

Cache::get($token);//抢购用户id$userID

$request-input(goods_id);//对应商品库存队列$goods

activity_goods_.$goodsID;//对应商品抢购成功用户集合

success_user.$goodsID;//进行判断当前用户是否在抢成功的队列里面$result

Redis::sismember($robSuccessUser,$userID);//如果你在这里面就抢完了if

($result)

已经抢光了哦]);}//把当前这个秒杀的uid存储到中奖的队列里set$success

$userID);if(!$success){//已经在成功队列里了加回库存,防止的是同个用户并发请求Redis::lpush($goods,

1);//如果抢购成功

,$request-header(authorization))[1];//进行查看$userInfo

Cache::get($token);//抢购用户id$userID

$request-input(goods_id);//对应商品抢购成功用户集合

success_user.$goodsID;//进行判断当前用户是否在抢成功的队列里面$result

Redis::sismember($robSuccessUser,$userID);//如果你在这里面就抢完了if

(!$result)

手慢了]);}DB::beginTransaction();try{//减库存//生成订单DB::commit();//下单成功跳转支付页面return

data