fix client error

@@ -31,7 +31,7 @@ function randomString(len) {
 }
 
 function loadTogetherProduct(params) {
-    var that = this;
+    var that = this || window;
 
     capi.getTogetherProduct(params).done(function(togetherInfo) {
         var _content;

@@ -164,7 +164,7 @@ function couponAlert(opt) {
 
 // 领取优惠券
 function pickCoupon(info) {
-    var that = this;
+    var that = this || window;
 
     if (that.picking || !info.id) {
         return;