sSpin:true

public/react/src/modules/courses/members/modal/AddStudentModal.js

@@ -93,13 +93,14 @@ class AddStudentModal extends Component{
   }
 
   onSendOk = () => {
-    this.setState({
-      isSpin:true
-    })
+    
     if(!this.state.checkBoxValues || this.state.checkBoxValues.length == 0) {
       this.props.showNotification('请从列表中先选择用户。')
       return;
     }
+    this.setState({
+      isSpin:true
+    })
     const courseId = this.props.match.params.coursesId   
     const url = `/courses/${courseId}/add_students_by_search.json`
     const params = {