query-string

@@ -42,12 +42,25 @@ let _queryString = function() {
 };
 
 let _sParamByIframe = function() {
-    let search = window.location.search;
-    if (search.indexOf('&expires=') === -1) {
-        search = search ? (search + '&') : '?';
-        search = search + 'expires=' + (7 * 24 * 60 * 60 * 1000);
+    let paramsObj = _queryString();
+    let queryArray = [];
+    let queryString = '?';
+
+    delete paramsObj['uid'];
+    delete paramsObj['app_version'];
+    delete paramsObj['client_type'];
+    delete paramsObj['session_key'];
+
+    for(let i in paramsObj) {
+        queryArray.push(i + '=' + paramsObj[i]);
     }
-    $('<iframe style="display:none;" src="//m.yohobuy.com/activity/wechat/1111' + search + '"></iframe>').prependTo('body');
+
+    if (!paramsObj['expires']) {
+        queryArray.push('expires=' + (7 * 24 * 60 * 60 * 1000));
+    }
+
+    queryString += queryArray.join('&');
+    $('<iframe style="display:none;" src="//m.yohobuy.com/activity/wechat/1111' + queryString + '"></iframe>').prependTo('body');
 };
 
 let _bindEvent = function() {