no message

chenxuan1/src/App.js

@@ -22,10 +22,8 @@ class App extends Component{
               <NavLink to='/ref2'>ref-内联函数</NavLink>
               <NavLink to='/ref3'>ref-函数</NavLink>
               <NavLink to='/ref4'>createRef</NavLink>
-              
               <NavLink to='/life'>生命周期函数</NavLink> 
               <NavLink to='/github'>github搜索demo</NavLink> 
-              <NavLink to='/confirm'>Confirm</NavLink>
               <NavLink to='/todo'>Todo</NavLink>
               <NavLink to='/toast'>Toast</NavLink>
               <NavLink to='/hoc1'>高阶组件1</NavLink>

chenxuan1/src/pages/confirm/index.jsx

@@ -1,11 +0,0 @@
-import React from "react";
-class App extends React.Component {
-  render() {
-    return (
-      <div>
-        <h1>Hello World</h1>
-      </div>
-    );
-  }
-}
-export default App

chenxuan1/src/router/index.jsx

@@ -10,7 +10,6 @@ import This from "../pages/this"
 import Life from "../pages/life"
 import Hoc1 from "../pages/hoc1"
 import Github from "../pages/github"
-import Confirm from "../pages/confirm"
 import Toast from "../pages/toast"
 const routes = [
     {
@@ -61,10 +60,6 @@ const routes = [
         path: "/github",
         component: Github
     },
-    {
-      path: "/confirm",
-      component: Confirm
-    },
     {
       path: "/toast",
       component: Toast

demo/confirm/src/components/index.js

@@ -5,7 +5,7 @@ const Confirm=(title,btnOptions)=>{
     let div=document.createElement('div');
     div.setAttribute('class','hehe')
     document.body.appendChild(div);
-    let confirmInt=ReactDom.render(<ConfirmDom></ConfirmDom>,div);
+    let confirmInt=ReactDom.createRoot(<ConfirmDom></ConfirmDom>,div);
     confirmInt.setMessage(title,btnOptions,div)
 }
 export default Confirm