fix:封面图统一文案

src/modules/course-manage/components/AddLiveBasic.jsx

@@ -235,7 +235,7 @@ class AddLiveBasic extends React.Component {
               <span className={`default-btn ${isDefaultCover ? 'disabled' : ''}`} onClick={this.handleResetCoverUrl}>
                 使用默认图
               </span>
-              <div className='tips'>建议尺寸1280*720px，图片支持jpg、jpeg、png格式。</div>
+              <div className='tips'>建议尺寸1280*720px或16:9。封面图最大5M，支持jpg、jpeg和png。</div>
             </div>
             <div className='img-content'>
               {isDefaultCover && <span className='tag'>默认图</span>}

src/modules/course-manage/offline-course/AddOfflineCourse.jsx

@@ -2,7 +2,7 @@
  * @Author: 吴文洁
  * @Date: 2020-08-05 10:07:47
  * @LastEditors: yuananting
- * @LastEditTime: 2021-07-07 14:51:41
+ * @LastEditTime: 2021-07-15 12:04:00
  * @Description: 线下课新增/编辑页
  * @Copyright: 杭州杰竞科技有限公司 版权所有
  */
@@ -830,7 +830,7 @@ class AddOfflineCourse extends React.Component {
                     <span className={`default-btn ${isDefaultCover ? 'disabled' : ''}`} onClick={this.handleResetCoverUrl}>
                       使用默认图
                     </span>
-                    <div className='tips'>建议尺寸1280*720px，图片支持jpg、jpeg、png格式。</div>
+                    <div className='tips'>建议尺寸1280*720px或16:9。封面图最大5M，支持jpg、jpeg和png。</div>
                   </div>
                   <div className='img-content'>
                     {isDefaultCover && <span className='tag'>默认图</span>}

src/modules/course-manage/video-course/AddVideoCourse.jsx

@@ -2,7 +2,7 @@
  * @Author: 吴文洁
  * @Date: 2020-08-05 10:07:47
  * @LastEditors: yuananting
- * @LastEditTime: 2021-07-14 16:41:36
+ * @LastEditTime: 2021-07-15 12:04:40
  * @Description: 线上课新增/编辑页
  * @Copyright: 杭州杰竞科技有限公司 版权所有
  */
@@ -880,7 +880,7 @@ class AddVideoCourse extends React.Component {
                   </If>
 
             <div className='cover-url flex mt16'>
-              <div className='label'>课程封面：</div> 
+              <div className='label'>封面图：</div> 
               <div className='cover-url__wrap'>
                 <div className='opt-btns'>
                   <div>