fix bug

apps/exams/Tpl/default/Index/examsroom_w3g.html

@@ -284,6 +284,7 @@
 
     var limit = parseInt("{$limit}");
     var id = "{$paper.exams_paper_id}";
+    var payUrl = "{:U('exams/index/getPayUrl')}";
 
     function changeCollect() {
         if (isCollect) {

apps/exams/_static/js/public_exam_3g.js

@@ -75,7 +75,7 @@ $(function() {
                 }
                 $.ajax({
                     type: "POST",
-                    url: "{:U('exams/index/getPayUrl')}",
+                    url: payUrl,
                     data: {
                         paper_id: id,
                     },