如果有居中设置，就添加居中对齐

src/views/book/courseware/preview/components/table/TablePreview.vue

@@ -1234,6 +1234,9 @@ export default {
             styleObject[key.trim()] = value.trim();
           }
         });
+        if (styleObject.hasOwnProperty('text-align') && styleObject['text-align'] === 'center') {
+          this.$set(styleObject, 'justify-content', 'center');
+        }
         return styleObject;
       }
       return {};