1、部署get-weixin-code.html至你的微信授权回调域名的目录下
例如http://wx.abc.com/get-weixin-...
2、在其他页面的使用方式如下，类似于直接通过微信回调的方式，只是将请求地址改成了get-weixin-code.html的地址，另外省 去了response_type参数（因为它只能为code）以及#wechat_redirect的hash
它们会在get-weixin-code.html里面去加上location.href = 'http://wx.abc.com/get-weixin-...' + encodeURIComponent(location.href);
3、get-weixin-code.html页面从微信那里拿到code之后会重新跳转回调用的页面，并且在url后面带上code
附上在CI框架中实现代码示例：
public function GetOpenid()
{
if (!isset($_GET['code']))
{
//触发微信返回code码
$redirect_uri = urlencode(site_url('wap/login/GetOpenid'));
$url = site_url('wap/common/get_weixin_code').'?appid='.APPID.'&scope=snsapi_userinfo&state=STATE&redirect_uri='.$redirect_uri;
//请求公共的地址
redirect($url);
exit();
} else {
//获取code码，以获取openid
$code = $_GET['code'];
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".APPID."&secret=".APPSECRET."&code={$code}&grant_type=authorization_code";
$result = weixinCurl($url); //curl请求微信获取access_token接口
print_r($result);
}
}
公共统一代码如下：get_weixin_code.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>微信登陆</title>
</head>
<body>
<script>
function getUrlParams(key) {
var args = {};
var pairs = location.search.substring(1).split('&');
for (var i = 0; i < pairs.length; i++) {
var pos = pairs[i].indexOf('=');
if (pos === -1) {
continue;
}
args[pairs[i].substring(0, pos)] = decodeURIComponent(pairs[i].substring(pos + 1));
}
return args[key];
}
function appendParams(params, url) {
var baseWithSearch = url.split('#')[0];
var hash = url.split('#')[1];
for (var i = 0; i < params.length; i++) {
if (params[i].value !== undefined) {
var newParam = params[i].key + "=" + params[i].value;
if (baseWithSearch.indexOf('?') > 0) {
var oldParamReg = new RegExp(params[i].key + '=[-\\w]{0,40}', '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;
}
var code = getUrlParams('code');
var appId = getUrlParams('appid');
var scope = getUrlParams('scope') || 'snsapi_base';
var state = getUrlParams('state');
var redirectUrl;
if (!code) {
redirectUrl = appendParams([{
key: 'appid',
value: appId
}, {
key: 'redirect_uri',
value: encodeURIComponent(location.href)
}, {
key: 'response_type',
value: 'code'
}, {
key: 'scope',
value: scope
}, {
key: 'state',
value: state
}], 'https://open.weixin.qq.com/connect/oauth2/authorize#wechat_redirect');
} else {
redirectUrl = appendParams([{key: 'code', value: code},{
key: 'state',
value: state
}], getUrlParams('redirect_uri'));
}
location.href = redirectUrl;
</script>
</body>
</html>
