优化代码。code review by LZF

@@ -94,8 +94,6 @@ function isWXOpen() {
 
     if (ua.indexOf('micromessenger') > 0) {
         return true;
-    } else {
-        return false;
     }
 }
 
@@ -138,9 +136,7 @@ function loadIcon() {
 }
 
 function showPage() {
-    var $pageList = $('.payapp-list');
-
-    $pageList.css('visibility', 'visible');
+    $('.payapp-list').css('visibility', 'visible');
 }
 
 if (wxHammer) {