import {Prompt } from "react-router-dom";

 <Prompt message="您確定要離開該頁面嗎?" />

 <Prompt message="您確定要離開該頁面嗎?" when={this.state.isOpen} />

 <Prompt
   message = {() => {
   this.state.isOpen? false: "您確定要離開該頁面嗎?"
}}
  />

<Prompt
   message = {(location)=>{
     if(!this.state.open) {
       let leave = window.confirm("您確定要離開該頁面嗎?")          
       if(!leave) {
         return false
       }          
     }else {
       this.setState({
       open: false
     })
     return false
     }
   }}
  />

import { Button, Form, Input, Modal } from "antd";
import { useState } from "react";
import { Prompt, useHistory } from "react-router-dom";

export default function PromptDemo() {
  const history = useHistory();
  const [form] = Form.useForm();
  const [isPrompt, setPrompt] = useState(false);

  const handlePrompt = () => {
    if (!isPrompt) {
      return true;
    }
    Modal.confirm({
      title: "未保存",
      content: "當(dāng)前內(nèi)容未保存，確認(rèn)退出嗎？",
      onOk: () => {
        setPrompt(false);
        history.goBack();
      }
    });
    return false;
  };

  const onFinish = (values: any) => {
    setPrompt(false);
    console.log(values);
  };
  return (
    <div style={{ width: "300px", padding: "40px" }}>
      <Prompt when={isPrompt} message={handlePrompt} />
      <Form form={form} labelCol={{ span: 6 }} onFinish={onFinish}>
        <Form.Item label="姓名" name="name">
          <Input onChange={() => setPrompt(true)} />
        </Form.Item>
        <Form.Item label="手機(jī)號(hào)" name="mobile">
          <Input onChange={() => setPrompt(true)} />
        </Form.Item>
        <Form.Item>
          <Button type="primary" htmlType="submit">
            保存
          </Button>
          <Button
            htmlType="button"
            style={{ marginLeft: "24px" }}
            onClick={() => history.goBack()}
          >
            返回
          </Button>
        </Form.Item>
      </Form>
    </div>
  );
}