issue

public/react/src/modules/courses/boards/BoardsNew.js

@@ -358,10 +358,15 @@ class BoardsNew extends Component{
                       dropdownRender={menu => (
                         <div>
                           {menu}
+                          {
+                            isAdmin && 
+                            <React.Fragment>
                               <Divider style={{ margin: '4px 0' }} />
                               <div style={{ padding: '8px', cursor: 'pointer' }} onMouseDown={() => this.refs['addDirModal'].open()}>
                                 <Icon type="plus" /> 添加目录
                               </div>
+                            </React.Fragment>
+                          }
                         </div>
                       )}
                     >

public/react/src/modules/courses/coursesPublic/NoneData.js

@@ -22,7 +22,7 @@ class NoneData extends Component{
             }
           `}
         </style>
-        <img className="edu-nodata-img mb20" src={getUrl("images/educoder/nodata.png")}/>
+        <img className="edu-nodata-img mb20" src={getUrl("/images/educoder/nodata.png")}/>
         <p className="edu-nodata-p mb20">暂时还没有相关数据哦！</p>
       </div>
     )

public/react/src/modules/courses/poll/Poll.js

@@ -288,6 +288,7 @@ class Poll extends Component{
             })
             let{type,StudentList_value}=this.state
             this.InitList(type,StudentList_value,1);
+            this.props.updataleftNavfun();
           }
         }).catch((error)=>{
           console.log(error);