更新

src/views/index.vue

@@ -345,7 +345,7 @@ export default {
       background-color: #99a9bf;
     }
 
-    .el-carousel__item:nth-child(2n+1) {
+    .el-carousel__item:nth-child(2n + 1) {
       background-color: #d3dce6;
     }
   }