[TOC]
## 获取小程序商品二维码
### 必须post请求
```
<script>
$.post("/app/index.php?i=1&c=entry&m=ewei_shopv2&do=mobile&r=getcode&id={$_GPC['id']}",{},function(result){
// console.log(1111,result)
$("#eweima").attr('src',"/app/index.php?i=1&c=entry&m=ewei_shopv2&do=mobile&r=getcode&id={$_GPC['id']}");
});
</script>
```
```
$id = intval($_GPC['id']);
$ret = $this->getCodeUnlimit(array('scene' => 'id=' . $id, 'page' => empty($id) ? 'pages/goods/index/index' : 'pages/goods/detail/index'));
header('content-type: image/png');
exit($ret);
```
```
public function getCodeUnlimit($params = array())
{
if (empty($params) || !(is_array($params)))
{
return error(-1, '参数错误(params)');
}
if (empty($params['scene']) || empty($params['page']))
{
return error(-1, '参数错误(scenepage)');
}
$accessToken = $this->getAccessToken();
if (is_error($accessToken))
{
return error(-1, $accessToken['message']);
}
load()->func('communication');
$request = ihttp_post('https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' . $accessToken, json_encode($params));
$content = json_decode($request['content'], true);
if (!(empty($content['errcode'])))
{
return error(-1, '(errcode: ' . $content['errcode'] . ') ' . $content['errmsg']);
}
return $request['content'];
}
```
```
public function getAccessToken()
{
global $_W;
$appset = m('common')->getSysset('app');
$cacheKey = 'eweishop:wxapp:accesstoken:' . $_W['uniacid'];
$accessToken = m('cache')->get($cacheKey, $_W['uniacid']);
if (!(empty($accessToken)) && !(empty($accessToken['token'])) && (TIMESTAMP < $accessToken['expire']))
{
return $accessToken['token'];
}
if (empty($appset['appid']) || empty($appset['secret']))
{
return error(-1, '未填写小程序的 appid 或 appsecret！');
}
load()->func('communication');
$content = ihttp_get('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' . $appset['appid'] . '&secret=' . $appset['secret']);
if (is_error($content))
{
return error(-1, '获取微信公众号授权失败, 请稍后重试！错误详情: ' . $content['message']);
}
$result = @json_decode($content['content'], true);
if (empty($result) || !(is_array($result)) || empty($result['access_token']) || empty($result['expires_in']))
{
$errorinfo = substr($content['meta'], strpos($content['meta'], '{'));
$errorinfo = @json_decode($errorinfo, true);
return error(-1, '获取微信公众号授权失败, 请稍后重试！ 公众平台返回原始数据为: 错误代码-' . $errorinfo['errcode'] . '，错误信息-' . $errorinfo['errmsg']);
}
$record['token'] = $result['access_token'];
$record['expire'] = (TIMESTAMP + $result['expires_in']) - 200;
m('cache')->set($cacheKey, $record, $_W['uniacid']);
return $result['access_token'];
}
```
