diff --git a/Bootstrap.Admin/wwwroot/lib/longbow/longbow.common.js b/Bootstrap.Admin/wwwroot/lib/longbow/longbow.common.js
index f200abe3..4a6a3632 100644
--- a/Bootstrap.Admin/wwwroot/lib/longbow/longbow.common.js
+++ b/Bootstrap.Admin/wwwroot/lib/longbow/longbow.common.js
@@ -238,7 +238,9 @@
         footer: function (options) {
             var op = $.extend({ header: "header", content: "body > section:first", ele: 'footer' }, options);
             var $ele = $(op.ele);
-            return $(op.header).outerHeight() + $(op.content).outerHeight() + $ele.outerHeight() > $(window).height() ? $ele.removeClass('position-fixed') : $ele.addClass('position-fixed');
+
+            // 增加 1px 修复 IE11 下由于小数点导致页脚消失bug
+            return $(op.header).outerHeight() + $(op.content).outerHeight() + $ele.outerHeight() > $(window).height() + 1 ? $ele.removeClass('position-fixed') : $ele.addClass('position-fixed');
         },
         formatUrl: function (url) {
             if (!url) return url;