[PHP知识库]laravel7接口与微信小程序秒杀功能

这边不讲思路只是部分代码实现过程

首先进入秒杀详情

<l-countdown time-type="second" time="{{time}}" bind:linend="stop" />
<l-card  type="primary" 
           l-img-class="right-card" 
           position="left" 
           image="{{details.detail.pic}}"
    title="{{details.detail.name}}">
    <view class="content">
      <view>{{details.detail.pice}}</view>
      <l-button type="error" disabled="{{disabled}}" bind:lintap="go" data-goods_id="{{details.goods_id}}">去抢</l-button>
    </view>
  </l-card>

渲染的值就自己改就好了

用了一些样式库 变量名和属性觉得不对就换成自己的见名思意就好

js

data: {
                details:[],
                time:0,
                disabled:false
        },

let id=options.id
requestReq.request(
        'show',
        {id}
).then(res=>{
        this.setData({
                details:res.data.data,
        })
        this.times()
})

按钮：（防抖动格式）网上一大堆封装引入就不写了

go:debounce(e=> {
                console.log(e[0])
                let goods_id=e[0].currentTarget.dataset.goods_id
                requestReq.request('go',{goods_id}).then(res=>{
                        console.log(res);
                        let code = res.statusCode.toString()
                        if (!code.startsWith('2')){
                        wx.showToast({
                         title: '异常！',
                         icon:1
                        })
                        }
                        if(res.data.code == 200){
                                wx.redirectTo({
                                  url: '/pages/order/order',
                                })
                        }else{
                                wx.showToast({
                                  title: res.data.msg,
                                })
                        }
                })
        }),

按钮接口：

public function go(Request $request)
    {
        //获取token
        $token=explode(' ',$request->header('authorization'))[1];
        //进行查看
        $user=Cache::get($token);
        //商品id
        $goods_id=$request->input('goods_id');
        //对应商品库存队列
        $redisKey = 'goods_list_'.$goods_id;
        //对应商品抢购成功用户集合 {1,3,4}
        $successUser='success_user'.$user['id'];
        //进行判断当前用户是否在抢成功的队列里面
        $res=Redis::sismember($successUser,$user['id']);
        if ($res){
            return response()->json(['code'=>203,'data'=>'','msg'=>'已经抢购过了']);
        }
        $count=Redis::lpop($redisKey);
        if (!$count){
            return response()->json(['code'=>202,'data'=>'','msg'=>'已经抢光了哦']);
        }
        $success = Redis::sadd($successUser, $user['id']);
        if (!$success){
            Redis::lpuch($redisKey,1);
            return  response()->json(['code'=>201,'data'=>'','msg'=>'已经抢购过了']);
        }
        return response()->json(['code' => 200, 'data' => '', 'msg' => '秒杀成功']);
    }

倒计时：

times(e){
                var starttime=this.data.details.start_time;
                console.log(starttime);
                var times = Date.parse(new Date())/1000;
                console.log(times);
                var timestamp=starttime-times
                console.log(timestamp);
                if(timestamp>0){
                        this.setData({
                                time:timestamp,
                                disabled:true
                                
                        })
                }
                if(timestamp<=0){
                        this.setData({
                                disabled:false
                        })
                }
                

        },

时间结束触发事件：

stop(){
                this.setData({
                        disabled:false 
                })
        },

秒杀成功后的生成订单

    public function order(Request $request)
    {
        //获取token
        $token=explode(' ',$request->header('authorization'))[1];
        //商品id
        $user=Cache::get($token);
        //商品id
        $goods_id=$request->input('goods_id');
        //对应商品抢购成功用户集合 {1,3,4}
        $successUser='success_user'.$user['id'];
        //进行判断当前用户是否在抢成功的队列里面
        $res=Redis::sismember($successUser,$user['id']);
        //如果你在这里面，就抢完了
        if (!$res){
            //如果抢购成功 返回状态码，进行下单
            return response()->json(['code' => 2003, 'data' => '', 'msg' => '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 response()->json(['code' => 200, 'data' => '', 'msg' => '下单成功！']);
        }catch (\Exception $e){
            DB::rollBack();
        }
    }

后台接口

库存预热：

在后台添加秒杀时的库存预热

public function createList(Request $request)
    {
        //查出所有参与秒杀活动列表
        $data=Details::with(['detail'])->where('goods_id',1)->first()->toArray();
        //库存
        $count = $data['num'];
        //生成对应商品库存队列
        $redisKey = 'goods_list_'.$data['goods_id'];
        for ($i = 1; $i <= $count; $i++) {
            Redis::rpush($redisKey, 1);
        }
    }