refactor: isElView in story player

Author: xieliuduo

frontend/src/app/pages/DashBoardPage/utils/board.ts

@@ -220,7 +220,7 @@ export const isElView = el => {
   // bottom 元素底部端到可见区域顶端的距离
   var viewHeight = window.innerHeight || document.documentElement.clientHeight; // 浏览器可见区域高度。
 
-  if (top < viewHeight && bottom > 0) {
+  if (top <= viewHeight && bottom >= 0) {
     bool = true;
   } else if (top >= viewHeight || bottom <= 0) {
     bool = false;