签约流程,指纹登录
diff --git a/www/js/qrcode.js b/www/js/qrcode.js
index b9d81b9..51b2aa1 100644
--- a/www/js/qrcode.js
+++ b/www/js/qrcode.js
@@ -22,6 +22,10 @@
             console.log(err);
           });
         }
+        document.addEventListener("backbutton", function(e){
+               e.preventDefault();
+               app.backTo();
+            }, false);
     },
     loadQrcode: function() {
         $.showLoading("加载中");
@@ -62,6 +66,7 @@
             if (ok) {
                 if (ret.code == 200) {
                     $.hideLoading();
+                    $("#qrcode").html('');
                     var qrcode = new QRCode(document.getElementById("qrcode"), {
                       text: ret.qrcode,
                       width: 200,