diff --git a/static/js/gofly-front.js b/static/js/gofly-front.js
index 805bec5..b88568d 100644
--- a/static/js/gofly-front.js
+++ b/static/js/gofly-front.js
@@ -71,7 +71,11 @@ GOFLY.dynamicLoadJs=function(url, callback){
GOFLY.clickBtn=function (){
var _this=this;
- $('body').append('');
+ var html="';
+ $('body').append(html);
$("#launchButton").on("click",function() {
_this.showKefu();
});