微信登錄

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為true時使用開放平臺作授權登錄，false為網頁掃碼登錄

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，沒有拿到code，跳轉至微信授權頁面獲取code

redirectUri = GWC.appendParams(baseUrl, {

'appid': appId,

'redirect_uri': encodeURIComponent(location.href),

'response_type': 'code',

'scope': scope,

'state': state,

});

} else {

//第二步，從微信授權頁面跳轉回來，已經獲取到了code，再次跳轉到實際所需頁面

redirectUri = GWC.appendParams(GWC.urlParams['redirect_uri'], {

'code': code,

'state': state

});

}

location.href = redirectUri;

}

};

GWC.getUrlParams();

GWC.doRedirect();

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