控制台报错

src/components/easy2/studyStudent.vue

@@ -24881,8 +24881,10 @@ export default {
         var a = document.getElementsByClassName("box_course")[0].offsetHeight;
         // document.getElementsByClassName("vedioList")[0].style.height = a + "px";
         if (this.showType == 2 || this.showType == 3) {
-          document.getElementsByClassName("navBox")[0].style.height =
-            a - 40 + 0 + "px";
+          if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
+            document.getElementsByClassName("navBox")[0].style.height =
+              a - 40 + 0 + "px";
+          }
         } else {
           if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
               document.getElementsByClassName("navBox")[0].style.height = a - 40 + "px";

src/components/easy3/studyStudent.vue

@@ -20249,8 +20249,10 @@ export default {
         var a = document.getElementsByClassName("box_course")[0].offsetHeight;
         // document.getElementsByClassName("vedioList")[0].style.height = a + "px";
         if (this.showType == 2 || this.showType == 3) {
-          document.getElementsByClassName("navBox")[0].style.height =
-            a - 40 + 0+ "px";
+            if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
+              document.getElementsByClassName("navBox")[0].style.height =
+                a - 40 + 0+ "px";
+            }
         } else {
           if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
               document.getElementsByClassName("navBox")[0].style.height = a - 40 + "px";

src/components/studyStudent.vue

@@ -20185,8 +20185,10 @@ export default {
         var a = document.getElementsByClassName("box_course")[0].offsetHeight;
         // document.getElementsByClassName("vedioList")[0].style.height = a + "px";
         if (this.showType == 2 || this.showType == 3) {
-          document.getElementsByClassName("navBox")[0].style.height =
-            a - 40 + 0+ "px";
+          if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
+            document.getElementsByClassName("navBox")[0].style.height =
+              a - 40 + 0+ "px";
+          }
         } else {
           if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
               document.getElementsByClassName("navBox")[0].style.height = a - 40 + "px";

src/components/studySutdentClass/studyStudent.vue

@@ -24312,8 +24312,10 @@ export default {
         var a = document.getElementsByClassName("box_course")[0].offsetHeight;
         // document.getElementsByClassName("vedioList")[0].style.height = a + "px";
         if (this.showType == 2 || this.showType == 3) {
-          document.getElementsByClassName("navBox")[0].style.height =
-            a - 40 + 0+ "px";
+          if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
+            document.getElementsByClassName("navBox")[0].style.height =
+              a - 40 + 0+ "px";
+          }
         } else {
             if (document.getElementsByClassName("navBox") && document.getElementsByClassName("navBox")[0]) {
               document.getElementsByClassName("navBox")[0].style.height = a - 40 + "px";