解决微信公众号网页授权只能设置一个回调域名的问题

2018-07-25· 500 次浏览
使用场景:一个公众号(服务号),下面部署了多个项目,每个项目都部署在不一样的服务器上面,多个域名。 需求:XX工作室公众号: 电商首页、微信订购两个项目部署 页面代码:get-weixin-code.html ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>微信登录</title> </head> <body> <script> var GWC = { version: '1.1.1', 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'] &##124;&##124; 'snsapi_base'; var state = GWC.urlParams['state']; var redirectUri; if (!code) { //第一步,没有拿到code,跳转至微信授权页面获取code redirectUri = GWC.appendParams('https://open.weixin.qq.com/connect/oauth2/authorize#wechat_redirect', { 'appid': appId, 'redirect_uri': encodeURIComponent(location.href), 'response_type': 'code', 'scope': scope, 'state': 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': state }); } location.href = redirectUri; } }; GWC.getUrlParams(); GWC.doRedirect(); </script> </body> </html> ``` 使用方法 部署get-weixin-code.html至你的微信授权回调域名的目录下 使用方式类似于直接通过微信回调的方式,只是将回调地址改成了get-weixin-code.html所在的地址,另外省去了response\_type参数(因为它只能为code)以及#wechat\_redirect(它是固定的),它们会在get-weixin-code.html里面自己加上get-weixin-code.html页面从微信那里拿到code之后会重新跳转回redirect_uri里面填写的url,并且在url后面带上code和state详细示例前往微信公众平台->接口权限->网页授权获取用户基本信息->修改,填写授权回调页面域名,例如[www.abc.com](http://www.abc.com)在[www.abc.com](http://www.abc.com)域名下部署get-weixin-code.html,不一定是根目录,例如:[http://www.abc.com/xxx/get-weixin-code.html](http://www.abc.com/xxx/get-weixin-code.html)假设你的[http://www.xyz.com/hello-world.html](http://www.xyz.com/hello-world.html)这个页面需要获取微信授权,那么你应该使用以下地址来获取授权:[http://www.abc.com/xxx/get-weixin-code.html?appid=XXXX&scope=snsapi\_base&state=hello-world&redirect\_uri=http%3A%2F%2Fwww.xyz.com%2Fhello-world.html](http://www.abc.com/xxx/get-weixin-code.html?appid=XXXX&scope=snsapi_base&state=hello-world&redirect_uri=http%3A%2F%2Fwww.xyz.com%2Fhello-world.html)这样最终就会跳转到这样一个地址:[http://www.xyz.com/hello-world.html?code=XXXXXXXXXXXXXXXXX&state=hello-world](http://www.xyz.com/hello-world.html?code=XXXXXXXXXXXXXXXXX&state=hello-world),从而你就拿到了授权code以及自定义的state参数了 eg:公众号回调地址:wxcsh.edsl.com.cn项目地址:wxcs78.edsl.com.cn通过loginByWeixin.do接口可以取到对应公众号的code,从而获取openId[http://wxcsh.edsl.com.cn/get-weixin-code.html?appid=wxa63f33a8579fdf36&scope=snsapi\_base&state=hello-world&redirect\_uri=http://wxcs78.edsl.com.cn/user/loginByWeixin.do](http://wxcsh.edsl.com.cn/get-weixin-code.html?appid=wxa63f33a8579fdf36&scope=snsapi_base&state=hello-world&redirect_uri=http://wxcs78.edsl.com.cn/user/loginByWeixin.do)