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1. 登录页面添加微信登录按钮
   

   
   

{if $openid==''}//判断是否登录状态
<div class="col-xs-4">
    <a href="javascript:;" class="btn btn-block btn-success btn-wechat" data-url="third/wechatlogin">
        <i class="fa fa-wechat"></i> 微信登录
    </a>
</div>
{/if}

//扫码登录页面

<div class="back_black">//back_black灰色半透明背景
    <div>
        <img src="" class="e_img">
        <i class="fa fa-close gb"></i>
        <p>请使用微信扫描二维码登录</p>
    </div>
</div>

2.点击微信登录按钮，发送ajax请求，获取临时二维码并显示在页面

$(".btn-wechat").click(function(){
    let url = $(this).data('url');
    Fast.api.ajax({
        url:url,
        data:{}
    }, function(data,ret){
        $(".e_img").attr('src',ret.url);
        $(".back_black").show();
        Controller.checkWait('1',ret.data);//定时请求登录状态
        return false;
        //成功的回调
    }, function(){
        return false;
        //失败的回调
    });
})

//每隔2秒请求数据，获取登录状态

checkWait(d,r){
    $("input[name='start']").val(d);
    var st=setInterval(
        function(){
            Fast.api.ajax({
                url:'third/checkLogin',
                data:{scene_str:r}//随机值赋值给scene_str
            }, function(data,ret){
                window.location.href=ret.url;
                return false;
                //成功的回调
            }, function(){
                return false;
                //失败的回调
            });
            var start = Number($("input[name='start']").val());
            if(start == 0){
                clearInterval(st);
            }
        },
        2000); //每2.5秒发送一次请求
}

//php生成二维码

public function wechatlogin(){
    $content=Random::uuid();//随机不重复字符串
    $app = Factory::officialAccount(Config::get('wechat'));//获取微信配置
    $result = $app->qrcode->temporary($content, 600);//二维码有效时间
    $url = $app->qrcode->url($result['ticket']);
    $dir = iconv("UTF-8", "GBK", ROOT_PATH."extend/qrcode");//创建路径
    if (!file_exists($dir)) {
        mkdir($dir, 0777, true);
    }
    $dir = ROOT_PATH."extend/qrcode/".$content.".txt";//随机字符串命名一个txt空文档
    $myfile=fopen($dir,"w");
    fwrite($myfile,'');
    fclose($myfile);
    $this->success('生成二维码', $url,$content);//返回二维码链接和随机值
}

//扫码登录的时候，获取随机字符串就是$message['EventKey']的值，再把扫码用户的openid写入这个txt文档

$myfile=fopen(ROOT_PATH."extend/qrcode/".$eventKey.".txt","w");
fwrite($myfile,$this->openid);
fclose($myfile);

//检查登录状态

public function checkLogin(){
    if($this->request->post("scene_str")){//获取到随机值
        $rand=$this->request->post("scene_str");
        $url = $this->request->get('url', 'index/index');
        if(file_exists(ROOT_PATH."extend/qrcode/".$rand.".txt")){//获取txt文档里面的openid
            $info = file_get_contents( ROOT_PATH."extend/qrcode/".$rand.".txt");
            if(!empty($info)){//如果有openid，表示已扫码登录，保存登录用户
                $user_admin = Db::name('admin')->where('openid',$info)->find();
                Session::set('admin', $user_admin);
                $keeptime=86400*7;
                $expiretime = time() + $keeptime;
                $key = md5(md5($user_admin['id']) . md5($keeptime) . md5($expiretime) . $user_admin['token'] . config('token.key'));
                $data = [$user_admin['id'], $keeptime, $expiretime, $key];
                Cookie::set('keeplogin', implode('|', $data), 86400 * 7);
            }
            $myfile=fopen(ROOT_PATH."extend/qrcode/".$rand.".txt","w");//清空openid
            fwrite($myfile,'');
            fclose($myfile);
        }
        if ($this->auth->isLogin()) {
            $this->success('登录成功', $url,'登录成功');//返回url登录成功后跳转的url
        }
    }
}