diff --git a/src/main/webapp/static/pdfjs/web/viewer.js b/src/main/webapp/static/pdfjs/web/viewer.js
index ccc1701..d8c5da4 100644
--- a/src/main/webapp/static/pdfjs/web/viewer.js
+++ b/src/main/webapp/static/pdfjs/web/viewer.js
@@ -1839,7 +1839,9 @@ var SecondaryToolbar = {
   // Event handling functions.
   presentationModeClick: function secondaryToolbarPresentationModeClick(evt) {
     PDFViewerApplication.requestPresentationMode();
-    $("#viewer").append("<div id='fullScreamBtn' class='fullScreamBtn'><i class='fa fa-search-plus fa-lg' id='plus' title='放大(快捷键ctrl+↑)'></i><i class='fa fa-search-minus fa-lg' id='minus' title='缩小(快捷键ctrl+↓)'></i><i class='fa fa-lg fa-undo' id='undo' title='逆时针旋转(快捷键ctrl+→)'></i><i class='fa fa-repeat fa-lg' id='repeat' title='顺时针旋转(快捷键ctrl+←)'></i><i class='fa fa-hand-paper-o fa-lg' id='hand-paper' title='启用手形工具(键盘按下Tab键)'></i></div>")
+    if ($("#fullScreamBtn").length == 0) {
+      $("#viewer").append("<div id='fullScreamBtn' class='fullScreamBtn'><i class='fa fa-search-plus fa-lg' id='plus' title='放大(快捷键ctrl+↑)'></i><i class='fa fa-search-minus fa-lg' id='minus' title='缩小(快捷键ctrl+↓)'></i><i class='fa fa-lg fa-undo' id='undo' title='逆时针旋转(快捷键ctrl+→)'></i><i class='fa fa-repeat fa-lg' id='repeat' title='顺时针旋转(快捷键ctrl+←)'></i><i class='fa fa-hand-paper-o fa-lg' id='hand-paper' title='启用手形工具(键盘按下Tab键)'></i></div>")
+    }
     //阻止外层div鼠标点击冒泡事件
     document.getElementById("fullScreamBtn").addEventListener("mousedown", function (evt) {
       evt.stopPropagation();
diff --git a/src/main/webapp/static/pdfjs/web/viewer1.js b/src/main/webapp/static/pdfjs/web/viewer1.js
index 6c9227c..b744998 100644
--- a/src/main/webapp/static/pdfjs/web/viewer1.js
+++ b/src/main/webapp/static/pdfjs/web/viewer1.js
@@ -1842,7 +1842,9 @@ var SecondaryToolbar = {
     // Event handling functions.
     presentationModeClick: function secondaryToolbarPresentationModeClick(evt) {
         PDFViewerApplication.requestPresentationMode();
-        $("#viewer").append("<div id='fullScreamBtn' class='fullScreamBtn'><i class='fa fa-search-plus fa-lg' id='plus' title='放大(快捷键ctrl+↑)'></i><i class='fa fa-search-minus fa-lg' id='minus' title='缩小(快捷键ctrl+↓)'></i><i class='fa fa-lg fa-undo' id='undo' title='逆时针旋转(快捷键ctrl+→)'></i><i class='fa fa-repeat fa-lg' id='repeat' title='顺时针旋转(快捷键ctrl+←)'></i><i class='fa fa-hand-paper-o fa-lg' id='hand-paper' title='启用手形工具(键盘按下Tab键)'></i></div>")
+        if ($("#fullScreamBtn").length == 0) {
+            $("#viewer").append("<div id='fullScreamBtn' class='fullScreamBtn'><i class='fa fa-search-plus fa-lg' id='plus' title='放大(快捷键ctrl+↑)'></i><i class='fa fa-search-minus fa-lg' id='minus' title='缩小(快捷键ctrl+↓)'></i><i class='fa fa-lg fa-undo' id='undo' title='逆时针旋转(快捷键ctrl+→)'></i><i class='fa fa-repeat fa-lg' id='repeat' title='顺时针旋转(快捷键ctrl+←)'></i><i class='fa fa-hand-paper-o fa-lg' id='hand-paper' title='启用手形工具(键盘按下Tab键)'></i></div>")
+        }
         //阻止外层div鼠标点击冒泡事件
         document.getElementById("fullScreamBtn").addEventListener("mousedown", function (evt) {
             evt.stopPropagation();