index page footer.Review by:@梁志锋

@@ -95,11 +95,15 @@ function getShoppingKey() {
 
 //根据页面内容重新设置通用底部的显示
 function rePosFooter() {
+    var winH;
+
     if ($footer.length === 0) {
         return;
     }
 
-    if ($('body').height() <= window.screen.availHeight - parseInt($footer.css('height'), 0)) {
+    winH = Math.min($(window).height(), window.screen.availHeight);
+
+    if ($('body').height() <= winH - parseInt($footer.css('height'), 0)) {
         $footer.addClass('bottom');
     } else {
         $footer.removeClass('bottom');