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codestate
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.htmlhttp://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.htmlhttp://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>
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