微信调用扫一扫功能实现

先配置微信的所有信息

前端代码

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <title>微信扫一扫</title>
    </head>
    <body>
        <h1 id="wxcode" style="text-align: center;">扫一扫</h1>

        <script type="text/javascript" src="./jquery-3.3.1.js"></script>
        <!--调用jquery.min.js文件-->
        <script src="https://res.wx.qq.com/open/js/jweixin-1.4.0.js"></script>
        <script>
            var appId = '';
            var timestamp = '';
            var nonceStr = '';
            var signature = '';
            $.ajax({
                type: "post",
                url: "index.php",
                cache: false,
                async: false,
                dataType: "json",
                success: function(e) {
                    alert(e)
                    appId = e.appId;
                    timestamp = e.timestamp;
                    nonceStr = e.nonceStr;
                    signature = e.signature;
                }
            });
            console.log(signature);
            wx.config({
                // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
                debug: true,
                // 必填，公众号的唯一标识
                // appId: "wx259ea197bf8b2eab",
                appId: appId,
                // 必填，生成签名的时间戳
                timestamp: timestamp,
                // 必填，生成签名的随机串
                nonceStr: nonceStr,
                // 必填，签名，见附录1
                // signature:"805c5e6f956fa5572b5b3ccc65d7581fe6cd37e1",
                signature: signature,
                // 必填，需要使用的JS接口列表，所有JS接口列表见附录2
                jsApiList: ['scanQRCode']
            });


            wx.error(function(res) {
                alert("----------出错了-----------：" + res.errMsg); //这个地方的好处就是wx.config配置错误，会弹出窗口哪里错误，然后根据微信文档查询即可。
            });


            wx.ready(function() {
                wx.checkJsApi({
                    jsApiList: ['scanQRCode'],
                    success: function(res) {
                        // console.log(444);
                    }
                });

                //点击按钮扫描二维码
                $('#wxcode').click(function() {
                    // alert(1);
                    wx.scanQRCode({
                        needResult: 1, // 默认为0，扫描结果由微信处理，1则直接返回扫描结果，
                        scanType: ["qrCode", "barCode"], // 可以指定扫二维码还是一维码，默认二者都有
                        success: function(res) {
                            var result = res.resultStr; // 当needResult 为 1 时，扫码返回的结果
                            alert(getQueryString('a'));
                        }

                    });
                })

            });

            function getQueryString(name) {
                var reg = new RegExp("\b" + name + "=([^&]*)");
                var r = location.href.match(reg);
                if (r != null) return unescape(r[1]);
            }


        </script>
    </body>
</html>

先接口获取微信签名信息，前端就可以使用了，一定要注意不要少获取了，不然采坑

<?php
class JSSDK {
private $appId;
private $appSecret;

public function __construct($appId, $appSecret) {
$this->appId = $appId;
$this->appSecret = $appSecret;
}

public function getSignPackage() {
$jsapiTicket = $this->getJsApiTicket();

// 注意 URL 一定要动态获取，不能 hardcode.
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
//$url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
$url = "https://qddsalesman.xzjumeng.com/1.html";

$timestamp = time();

$nonceStr = $this->createNonceStr();

// 这里参数的顺序要按照 key 值 ASCII 码升序排序
$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
//$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
//echo $string;
$signature = sha1($string);

$signPackage = array(
"appId" => $this->appId,
"nonceStr" => $nonceStr,
"timestamp" => $timestamp,
"url" => $url,
"signature" => $signature,
"rawString" => $string
);
return $signPackage; 
}

private function createNonceStr($length = 16) {
$chars = "abcdefg******************YZ0123456789";
$str = "";
for ($i = 0; $i < $length; $i++) {
$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
return $str;
}

private function getJsApiTicket() {
// jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
$data = json_decode(file_get_contents("./jsapi_ticket.json"));
// var_dump($data);
if ($data->expire_time < time() || empty($data)) {
    // echo 1;die;
$accessToken = $this->getAccessToken();
//var_dump($accessToken);die;
// 如果是企业号用以下 URL 获取 ticket
// $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
$res = json_decode($this->httpGet($url));
//var_dump($res);die;
$ticket = $res->ticket;
if ($ticket) {
$data->expire_time = time() + 7000;
$data->jsapi_ticket = $ticket;
$fp = fopen("./jsapi_ticket.json", "w");
fwrite($fp, json_encode($data));
fclose($fp);
}
} else {
$ticket = $data->jsapi_ticket;
}

return $ticket;
}

private function getAccessToken() {
// access_token 应该全局存储与更新，以下代码以写入到文件中做示例
$data = json_decode(file_get_contents("./access_token.json"));
if ($data->expire_time < time() || empty($data)) {
// 如果是企业号用以下URL获取access_token
// $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
$res = json_decode($this->httpGet($url));
$access_token = $res->access_token;
if ($access_token) {
$data->expire_time = time() + 7000;
$data->access_token = $access_token;
$fp = fopen("./access_token.json", "w");
fwrite($fp, json_encode($data));
fclose($fp);
}
} else {
$access_token = $data->access_token;
}
return $access_token;
}

private function httpGet($url) {
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 500);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_URL, $url);

$res = curl_exec($curl);
curl_close($curl);

return $res;
}
}
$jssdk = new JSSDK("wx********c8", "56*************13f");
$signPackage = $jssdk->GetSignPackage();
// var_dump($signPackage);die;
$json = json_encode($signPackage);
echo $json;
?>