转载自 https://github.com/HADB/GetWeixinCode
使用方法
部署
至你的微信授权回调域名的目录下get-weixin-code.html
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
所在的地址,另外省去了get-weixin-code.html
参数(因为它只能为response_type
)以及code
(它是固定的),它们会在#wechat_redirect
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get-weixin-code.html
里面填写的url,并且在url后面带上redirect_uri
和code
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
在
域名下部署www.abc.com
,不一定是根目录,例如:get-weixin-code.html
http://www.abc.com/xxx/get-weixin-code.html
假设你的
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.xyz.com/hello-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:
,从而你就拿到了授权http://www.xyz.com/hello-world.html?code=XXXXXXXXXXXXXXXXX&state=hello-world
以及自定义的code
参数了state
<!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'] || '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>