no message

chenxuan1/src/pages/life.jsx

@@ -1,5 +1,4 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
 class Child extends React.Component{
   state={count:0}
  

chenxuan1/src/pages/ref2.jsx

@@ -1,8 +1,5 @@
 import React from "react";
 class Ref extends React.Component {
-  constructor(props) {
-    super(props);
-  }
   haha=()=> {
     const {hehe}=this
     alert(hehe.value)

chenxuan1/src/pages/ref3.jsx

@@ -1,8 +1,5 @@
 import React from "react";
 class Ref extends React.Component {
-  constructor(props) {
-    super(props);
-  }
   haha=(c)=> {
     this.hehe=c
   }