调整

public/react/src/modules/courses/exercise/Studentshavecompletedthelist.js

@@ -1272,7 +1272,11 @@ class Studentshavecompletedthelist extends Component {
 		//被columnsys当作参数接收
 		// console.log("componentDidMount");
 		// console.log(columnsystwo);
+		try {
 			columnsystwo=this.state.columnsys;
+		}catch (e) {
+
+		}
    // console.log(columnsystwo);
 		this.Teacherliststudentlist();