修改绑定功能
diff --git a/www/js/bill.js b/www/js/bill.js
index 4b0bca5..c0af3fd 100644
--- a/www/js/bill.js
+++ b/www/js/bill.js
@@ -9,6 +9,9 @@
         curpage = 1;
         this.loadBill(curpage)
     },
+    toBack: function (){
+        window.history.back();
+    },
     loadBill:function(pageno){
         $.showLoading("加载中");
         var param={