增加cover参数

@@ -41,6 +41,7 @@ exports.wechatShare = (req, res, next) => {
 exports.feature = (req, res) => {
     let mktCode = req.query.mkt_code || req.query.union_type || false;
     let expires = req.query.expires;
+    let cover = req.query.cover;
     
     if (mktCode) {
         res.cookie('unionTypeYas', mktCode, { // 下载浮层
@@ -55,7 +56,7 @@ exports.feature = (req, res) => {
 
         expires && (options.expires = new Date(Date.now() + Number(expires)));
 
-        if (req.yoho.isWechat) {
+        if (req.yoho.isWechat || cover) {
             // 微信中，不管是否已经种入cookie，直接覆盖
             res.cookie('mkt_code', mktCode, options);
         } else if (!req.cookies.mkt_code) {