diff --git a/public/react/src/modules/courses/coursesDetail/CoursesLeftNav.js b/public/react/src/modules/courses/coursesDetail/CoursesLeftNav.js
index d3b68ac32..16c71f942 100644
--- a/public/react/src/modules/courses/coursesDetail/CoursesLeftNav.js
+++ b/public/react/src/modules/courses/coursesDetail/CoursesLeftNav.js
@@ -880,10 +880,8 @@ class Coursesleftnav extends Component{
                     return(
                         <div key={key} 	>
                             <a>
-
-                              <li onClick={(e)=>this.showsandians(e,key,item.category_url,1)}   className={this.props.mainurl===item.category_url&&key===this.props.indexs?"liactive":"clearfix active"}   onMouseLeave={(e)=>this.hidesandian(e,key)}  onMouseEnter={(e)=>this.showsandian(e,key)}>
-																<Tooltip placement="bottom" title={item.name.length<7?"":item.name}>
-																<a onClick={(e)=>this.showsandians(e,key,item.category_url,1)}  className={ item.second_category===undefined?"fl ml20 pd0":item.second_category.length===0?"fl ml20 pd0":this.state.sandiantypes===key?"fl ml20 pd0 ebebeb":"fl ml20 pd0"}>
+                            <li title={item.name.length<7?"":item.name} onClick={(e)=>this.showsandians(e,key,item.category_url,1)}   className={this.props.mainurl===item.category_url&&key===this.props.indexs?"liactive":"clearfix active"}   onMouseLeave={(e)=>this.hidesandian(e,key)}  onMouseEnter={(e)=>this.showsandian(e,key)}>
+                                <a onClick={(e)=>this.showsandians(e,key,item.category_url,1)}  className={ item.second_category===undefined?"fl ml20 pd0":item.second_category.length===0?"fl ml20 pd0":this.state.sandiantypes===key?"fl ml20 pd0 ebebeb":"fl ml20 pd0"}>
                                   {
                                     item.type==="announcement"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-xiaoxi1 mr10 fl":"iconfont icon-xiaoxi1 mr10 fl"}></i>:
                                     item.type==="online_learning"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-xuexizhongxin mr10 fl":"iconfont icon-xuexizhongxin mr10 fl"}></i>:
@@ -914,8 +912,7 @@ class Coursesleftnav extends Component{
 
                                   </Popover>:""}
                                 </a>
-																</Tooltip>
-                               </li>
+                            </li>
 
                             {/*下拉列表*/}
 
@@ -953,15 +950,14 @@ class Coursesleftnav extends Component{
                                                             >
                                                               {/*"/courses/"+this.props.match.params.coursesId+"/"+item.type+"/"+iem.category_type+"/"+iem.category_id*/}
                                                               <a  className={"Draggablelichild"}>
-
                                                               <li className="clearfix width93 Draggableli" key={index} onClick={(e)=>this.selectnavids(e,key,iem.category_id,item.type+"child",iem.second_category_url,key)}  onMouseLeave={(e)=>this.twosandianhide(e,index,item.type)} onMouseEnter={(e)=>this.twosandianshow(e,index,item.type)}
                                                               key={index}
                                                               ref={provided.innerRef}
                                                               {...provided.draggableProps}
                                                               {...provided.dragHandleProps}
-
+																														  title={iem.category_name.length<10?"":iem.category_name}
                                                               >
-																																<Tooltip placement="bottom" title={iem.category_name.length<10?"":iem.category_name}>
+
                                                                 <a className="fl pl46 pd0  Draggablelichild">
                                                                   <span className={this.props.location.pathname===iem.second_category_url?"color-blue fl ml38 maxwidth155 task-hide  Draggablelichild":"fl ml38 maxwidth155 task-hide  Draggablelichild"}>{iem.category_name}</span>
                                                                   <span className={twosandiantype===undefined?this.props.location.pathname===iem.second_category_url?"fr mr20 color-blue Draggablelichild font-14":"fr mr20 color999  Draggablelichild font-14":item.type===twosandiantypes&&twosandiantype===index&&iem.category_id!=0?"none":this.props.location.pathname===iem.second_category_url?"fr mr20 color-blue Draggablelichild font-14":"fr mr20 color999  Draggablelichild font-14"} >{iem.category_count===0?"":iem.category_count}</span>
@@ -975,7 +971,6 @@ class Coursesleftnav extends Component{
                                                                 </a>
 
                                                                   {provided.placeholder}
-																																</Tooltip>
                                                               </li>
                                                               </a>
                                                             </Tooltip>
@@ -998,35 +993,31 @@ class Coursesleftnav extends Component{
                return(
                  <div key={key}>
                    {/*<Tooltip placement="bottom" title={"点击空白处展开二级菜单，点击模块名字跳转到对应模块"}>*/}
-                   <a>
-
-											 <li className={this.props.mainurl===item.category_url&&key===this.props.indexs?"liactive":"clearfix active"}
-													 onClick={(e)=>this.setnavid(e,key,item.id,item.type,item.category_url)}  onMouseEnter={(e)=>this.showsandian(e,key)}
-
-											 >
-												 <Tooltip placement="bottom" title={item.name.length<7?"":item.name}>
-													 <a className={ item.second_category===undefined?"fl ml20 pd0":item.second_category.length===0?"fl ml20 pd0":this.state.sandiantypes===key?"fl ml20 pd0 ebebeb":"fl ml20 pd0"}>
-													 {
-														 item.type==="announcement"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-xiaoxi1 mr10 fl":"iconfont icon-xiaoxi1 mr10 fl"}></i>:
-														 item.type==="online_learning"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-xuexizhongxin mr10 fl":"iconfont icon-xuexizhongxin mr10 fl"}></i>:
-														 item.type==="shixun_homework"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-daima mr10 fl":"iconfont icon-daima mr10 fl"}></i>:
-															 item.type==="common_homework"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-putongzuoye mr10 fl":"iconfont icon-putongzuoye mr10 fl"}></i>:
-																 item.type==="group_homework"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-fenzuzuoye mr10 fl":"iconfont icon-fenzuzuoye mr10 fl"}></i>:
-																	 item.type==="graduation"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-biyezhuanhuan mr10 fl":"iconfont icon-biyezhuanhuan mr10 fl"}></i>:
-																		 item.type==="exercise"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-shijuan mr10 fl":"iconfont icon-shijuan mr10 fl"}></i>:
-																			 item.type==="poll"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-wenjuan mr10 fl":"iconfont icon-wenjuan mr10 fl"}></i>:
-																				 item.type==="attachment"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-ziyuan mr10 fl":"iconfont icon-ziyuan mr10 fl"}  ></i>:
-																					 item.type==="board"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-taolun mr10 fl":"iconfont icon-taolun mr10 fl"}  ></i>:
-																						 item.type==="course_group"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-fenban mr10 fl":"iconfont icon-fenban mr10 fl"}  ></i>:""
-													 }
-
-													 <span className={this.props.location.pathname===item.category_url?"color-blue task-hide activity-left-name":"task-hide activity-left-name"} onClick={(e)=>this.selectnavid(e,key,item.id,item.type,item.category_url)}>{item.name}</span>
-													 <span className={this.props.location.pathname===item.category_url?"color-blue fr mr20 font-14":"fr mr20 color999 font-14"}>{item.task_count===0?"":item.task_count}</span>
-
-													 </a>
-												 </Tooltip>
-											 </li>
-
+                   <a >
+                   <li className={this.props.mainurl===item.category_url&&key===this.props.indexs?"liactive":"clearfix active"}
+                       onClick={(e)=>this.setnavid(e,key,item.id,item.type,item.category_url)}  onMouseEnter={(e)=>this.showsandian(e,key)}
+											 title={item.name.length<7?"":item.name}
+                   >
+                       <a className={ item.second_category===undefined?"fl ml20 pd0":item.second_category.length===0?"fl ml20 pd0":this.state.sandiantypes===key?"fl ml20 pd0 ebebeb":"fl ml20 pd0"}>
+                       {
+                         item.type==="announcement"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-xiaoxi1 mr10 fl":"iconfont icon-xiaoxi1 mr10 fl"}></i>:
+                         item.type==="online_learning"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-xuexizhongxin mr10 fl":"iconfont icon-xuexizhongxin mr10 fl"}></i>:
+                         item.type==="shixun_homework"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-daima mr10 fl":"iconfont icon-daima mr10 fl"}></i>:
+                           item.type==="common_homework"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-putongzuoye mr10 fl":"iconfont icon-putongzuoye mr10 fl"}></i>:
+                             item.type==="group_homework"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-fenzuzuoye mr10 fl":"iconfont icon-fenzuzuoye mr10 fl"}></i>:
+                               item.type==="graduation"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-biyezhuanhuan mr10 fl":"iconfont icon-biyezhuanhuan mr10 fl"}></i>:
+                                 item.type==="exercise"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-shijuan mr10 fl":"iconfont icon-shijuan mr10 fl"}></i>:
+                                   item.type==="poll"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-wenjuan mr10 fl":"iconfont icon-wenjuan mr10 fl"}></i>:
+                                     item.type==="attachment"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-ziyuan mr10 fl":"iconfont icon-ziyuan mr10 fl"}  ></i>:
+                                       item.type==="board"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-taolun mr10 fl":"iconfont icon-taolun mr10 fl"}  ></i>:
+                                         item.type==="course_group"?<i className={this.props.location.pathname===item.category_url?"color-blue iconfont icon-fenban mr10 fl":"iconfont icon-fenban mr10 fl"}  ></i>:""
+                       }
+
+                       <span className={this.props.location.pathname===item.category_url?"color-blue task-hide activity-left-name":"task-hide activity-left-name"} onClick={(e)=>this.selectnavid(e,key,item.id,item.type,item.category_url)}>{item.name}</span>
+                       <span className={this.props.location.pathname===item.category_url?"color-blue fr mr20 font-14":"fr mr20 color999 font-14"}>{item.task_count===0?"":item.task_count}</span>
+
+                       </a>
+                   </li>
                    </a>
                    {/*</Tooltip>*/}
 
@@ -1044,9 +1035,8 @@ class Coursesleftnav extends Component{
                            }
                          }
                          return(
-                           <a>
-                               <li className="clearfix Draggableli" key={index} style={{ width: '244px'}}>
-																 <Tooltip placement="bottom" title={iem.category_name.length<10?"":iem.category_name}>
+                           <a >
+                               <li className="clearfix Draggableli" key={index} style={{ width: '244px'}} title={iem.category_name.length<10?"":iem.category_name}>
                                  <a className="fl pl46 pd0 Draggablelichild" onClick={(e)=>this.selectnavids(e,key,iem.category_id,item.type+"child",iem.second_category_url,key)} >
 
                                      {/*<span className="fl ml38 maxwidth155 task-hide">{iem.category_name}</span>*/}
@@ -1054,7 +1044,6 @@ class Coursesleftnav extends Component{
 
                                    <span className={twosandiantype===undefined?this.props.location.pathname===iem.second_category_url?"fr mr20 color-blue font-14":"fr mr20 color999 font-14":twosandiantype===index&&item.type!="graduation"?"none":this.props.location.pathname===iem.second_category_url?"fr mr20 color-blue font-14":"fr mr20 color999 font-14"}>{iem.category_count===0?"":iem.category_count}</span>
                                  </a>
-																 </Tooltip>
                                </li>
                            </a>
                          )