H5项目必备技能:公众号无限回调

2025-11-17 11:42:44

1、假设我们需要回调的网站是B,域名为b.b.com,我们用作无限回调的网站是A,域名是a.a.com。这里新建一个网站A,根目录中放入公众号的验证文件(txt格式,在域名修改页面下载),另外新建一个html文件,例如:huidiao.html.

2、huidiao.html文件内容如下:

<!DOCTYPE html>


<html><head>
    <meta charset="UTF-8">
    <title>微信登录</title>    //边城烟雨友情分享(QQ微信同号1022144435)
</head><body>
    <script>
        var GWC = {
            version: '1.2.0',
            urlParams: {},
            appendParams: function (url, params) {
                if (params) {
                    var baseWithSearch = url.split('#')[0];
                    var hash = url.split('#')[1];
                    for (var key in params) {
                        var attrValue = params[key];
                        if (attrValue !== undefined) {
                            var newParam = key + "=" + attrValue;
                            if (baseWithSearch.indexOf('?') > 0) {
                                var oldParamReg = new RegExp('^' + key + '=[-%.!~*\'\(\)\\w]*', 'g');
                                if (oldParamReg.test(baseWithSearch)) {
                                    baseWithSearch = baseWithSearch.replace(oldParamReg, newParam);
                                } else {
                                    baseWithSearch += "&" + newParam;
                                }
                            } else {
                                baseWithSearch += "?" + newParam;
                            }
                        }
                    }                    if (hash) {
                        url = baseWithSearch + '#' + hash;
                    } else {
                        url = baseWithSearch;
                    }
                }
                return url;
            },
            getUrlParams: function () {
                var pairs = location.search.substring(1).split('&');
                for (var i = 0; i < pairs.length; i++) {
                    var pos = pairs[i].indexOf('=');
                    if (pos === -1) {
                        continue;
                    }
                    GWC.urlParams[pairs[i].substring(0, pos)] = decodeURIComponent(pairs[i].substring(pos + 1));
                }
            },
            doRedirect: function () {
                var code = GWC.urlParams['code'];
                var appId = GWC.urlParams['appid'];
                var scope = GWC.urlParams['scope'] || 'snsapi_base';
                var state = GWC.urlParams['state'];
                var isMp = GWC.urlParams['isMp']; //isMp为true时使用开放平台作授权登录,false为网页扫码登录
                var baseUrl;
                var redirectUri;                if (!code) {
                    baseUrl = "https://open.weixin.qq.com/connect/oauth2/authorize#wechat_redirect";
                    if (scope == 'snsapi_login' && !isMp) {
                        baseUrl = "https://open.weixin.qq.com/connect/qrconnect";
                    }
                    //第一步,没有拿到code,跳转至微信授权页面获取code
                    redirectUri = GWC.appendParams(baseUrl, {
                        'appid': appId,
                        'redirect_uri': encodeURIComponent(location.href),
                        'response_type': 'code',
                        'scope': scope,
                        'state': encodeURIComponent(state),
                    });
                } else {
                    //第二步,从微信授权页面跳转回来,已经获取到了code,再次跳转到实际所需页面
                    redirectUri = GWC.appendParams(GWC.urlParams['redirect_uri'], {
                        'code': code,
                        'state': encodeURIComponent(state)
                    });
                }                location.href = redirectUri;
            }
        };        GWC.getUrlParams();
        GWC.doRedirect();
    </script>
</body></html>

3、微信后台填入A的域名,并设置对应的IP白名单,这一步和一般的对接是一样的。

4、至此,基本工作已经完成了。接下来写入网站B的回调。一般的回调是下面这样:

$appid=”这里是公众号APPID″;


$key=”这里是公众号密钥″;

//公众号接口


 https://open.weixin.qq.com/connect/oauth2/authorize?appid=

如果这样,你每个月还是只能修改三次,这时候A就派上用场了,我们将B的回调改成这个

http://a.a.com/get-weixin-code.html?appid=

这样,你有多少个网站需要回调都可以,官方只是验证appid和密钥。

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