Add back to top (#213)

* translate_Chinese

* translate_Chinese

* Add one-click return to the top function on the article page

Signed-off-by: Ray <Chow-Ray@outlook.com>

* Fix scroll-to-top button

Signed-off-by: hossainemruz <hossainemruz@gmail.com>

Co-authored-by: Emruz Hossain <hossainemruz@gmail.com>

static/js/single.js

@@ -59,5 +59,23 @@ var isMobile = false, isTablet = false, isLaptop = false;
       elems[i].classList.add("nav-link");
     }
 
+    // add scroll to top button
+    function scrollToTop() {
+      var btn = $('#scroll-to-top');
+      $(window).scroll(function () {
+        if ($(window).scrollTop() > 300) {
+          btn.addClass('show');
+        } else {
+          btn.removeClass('show');
+        }
+      });
+
+      btn.on('click', function (e) {
+        e.preventDefault();
+        $('html, body').animate({ scrollTop: 0 }, '300');
+      });
+    }
+    scrollToTop();
+
   });
 })(jQuery);