switch to jquery as Liangzhifeng comments. code review by bikai

@@ -6,7 +6,7 @@
 var $ = require('jquery');
 
 var loading = require('../plugin/loading'),
-    tip = require('../plugin/tip');
+    tip = require('../plugin/tip'),
     Hammer = require('yoho.hammer');
 
 var theOrderCode = document.getElementById('ordercode').value;
@@ -100,13 +100,13 @@ function isWXOpen() {
 }
 
 function hideWeChatPay() {
-    var payApps = $('.app');
+    var $payApps = $('.app');
 
-    payApps.each(function(idx, app) {
-       if ($(app).attr('id') === 'weixin') {
-           $(app).parent().css('display', 'none');
-           return false;
-       }
+    $payApps.each(function(idx, app) {
+        if ($(app).attr('id') === 'weixin') {
+            $(app).parent().css('display', 'none');
+            return false;
+        }
     });
 }
 
@@ -122,25 +122,25 @@ function setAppIcon(el, position) {
 }
 
 function loadIcon() {
-    var boxs = $('.box');
-    var div = null;
+    var $boxs = $('.box');
+    var $div = null;
     var appid = null;
 
-    boxs.each(function(idx, box) {
-        div = $(box).find('.icon').find('div');
-        if (div.length > 0) {
+    $boxs.each(function(idx, box) {
+        $div = $(box).find('.icon').find('div');
+        if ($div.length > 0) {
             appid = $(box).attr('id');
             if (appid !== 'alipay') {
-                setAppIcon(div, appIconPosition[appid]);
+                setAppIcon($div, appIconPosition[appid]);
             }
         }
     });
 }
 
 function showPage() {
-    var pageList = $('.payapp-list');
+    var $pageList = $('.payapp-list');
 
-    pageList.css('visibility', 'visible');
+    $pageList.css('visibility', 'visible');
 }
 
 if (wxHammer) {