diff --git a/site/static/script.js b/site/static/script.js
index ceea48e9c5..2e9113af14 100644
--- a/site/static/script.js
+++ b/site/static/script.js
@@ -58,39 +58,39 @@ InstantClickChangeFns.push(function() {
   $('.markdown #api').nextAll().andSelf().appendTo('.api-container');
 
   // 滚动时固定锚点、高亮当前项
-  var titles = $('.markdown :header:not(h1)');
-  var doc = $(document);
-  var tocTop = $('.toc').offset().top;
-  function onScroll() {
-    var top = doc.scrollTop(), i;
-    if (top >= doc.height()- $(window).height() - 20) {
-      i = titles.length - 1;
-    } else {
-      for (i=0; i<titles.length; i++) {
-        if (top < titles.eq(i).offset().top - 20) {
-          break;
+  if ($('.toc')[0]) {
+    var titles = $('.markdown :header:not(h1)');
+    var doc = $(document);
+    var tocTop = $('.toc').offset().top;
+    function onScroll() {
+      var top = doc.scrollTop(), i;
+      if (top >= doc.height()- $(window).height() - 20) {
+        i = titles.length - 1;
+      } else {
+        for (i=0; i<titles.length; i++) {
+          if (top < titles.eq(i).offset().top - 20) {
+            break;
+          }
         }
+        i--;
+        i = (i < 0) ? 0 : i;
+        i = (i > titles.length - 1) ? (titles.length - 1) : i;
       }
-      i--;
-      i = (i < 0) ? 0 : i;
-      i = (i > titles.length - 1) ? (titles.length - 1) : i;
-    }
-    $('.anchor a').removeClass('current');
-    $('.anchor a').eq(i).addClass('current');
+      $('.anchor a').removeClass('current');
+      $('.anchor a').eq(i).addClass('current');
 
-    if (top >= tocTop) {
-      $('.toc').addClass('sticky');
-    } else {
-      $('.toc').removeClass('sticky');
+      if (top >= tocTop) {
+        $('.toc').addClass('sticky');
+      } else {
+        $('.toc').removeClass('sticky');
+      }
     }
+    onScroll();
+    // 滚动高亮
+    $(window).off('scroll');
+    $(window).on('scroll', onScroll);
   }
 
-  onScroll();
-
-  // 滚动高亮
-  $(window).off('scroll');
-  $(window).on('scroll', onScroll);
-
   // 添加上一页下一页
   if ($('.aside-container li > a').length > 0) {
     var links = $('.aside-container li > a');