fix:下拉框不跟随滚动问题

src/views/courselibrary/courseModal.vue

@@ -193,6 +193,11 @@
                 <div class="item_inp">
                   <div class="select i6_input">
                     <a-tree-select
+                      :getPopupContainer="
+                        (triggerNode) => {
+                          return triggerNode.parentNode || document.body;
+                        }
+                      "
                       v-model:value="fen_lei"
                       show-search
                       style="width: 440px"