(react)获取json数据与传入(antd配合)

import React from 'react';
import {fetch} from 'whatwg-fetch';
// import {HashRouter as Router,Route,Redirect,Switch} from 'react-router-dom'
import { Table,Input,Button,Radio,Modal} from 'antd';

import './index.css';

export default class Home extends React.Component {
constructor(props){
		super(props)
		this.state = {
			 columns : [
  { title: 'id', dataIndex: 'id', key: 'id' },
  { title: '日期', dataIndex: 'date', key: 'date' },
  { title: '姓名', dataIndex: 'name', key: 'name' },
  { title: '地址', dataIndex: 'address', key: 'address' },
  {title: '删除', dataIndex: '',key: 'x',render: () => <a href="javascript:;">Delete</a>,},
],
data:[] ,
visible: false,

id:3,
xm:'',
dizhi:'',
date:'',
		}
	}

	render() {

				return(
					<div className='app'>
					<Table
    columns={this.state.columns}

    dataSource={this.state.data}
  />,
 <Button className='btn' type="primary" shape="round" onClick={this.showModal} >
         添加项目
        </Button>

        <Modal
          title="录入用户"
          visible={this.state.visible}
          onOk={this.handleOk}
					okText='确认'
          onCancel={this.handleCancel}
					cancelText='取消'
        >
          <p>姓名:<Input  className='inp' placeholder="请输入姓名" onChange={this.xm.bind(this)} /></p>
          <p>地址:<Input className='inp' placeholder="请输入地址" onChange={this.dz.bind(this)} /></p>

        </Modal>

					</div>

		)
	}
componentDidMount(){
//获取json里的数据
	var that = this;
		fetch("http://localhost:3000/user", {
	  method: "GET",
	  // headers: {
	  //     "Content-Type": "application/json",
	  // },
	  // mode: "cors",
	  // body: JSON.stringify({
	  //     content: "留言内容"
	  // })
	}).then((res)=>
	 res.json()
	).then((res)=> {

		 			that.setState({

		 			data:res,

		 		})
				console.log(res)
	}).catch((err) =>{
	  console.log(err);
	});

}
xm = (e)=>{
	//var that = this;
	let val = e.target.value;

	console.log(val)
	this.setState({
		xm:val,
		val:''
	})

}

dz = (e)=>{
	//var that = this;
	let val = e.target.value;
	console.log(val)
	this.setState({
		dz:val,
		val:''
	})
}

showModal = () => {
    this.setState({
      visible: true,
    });
  };

  handleOk = e => {

		let date = new Date();
			let asd = date.getTime();
   let obj={
			date:asd,
      name:this.state.xm,
      address:this.state.dz,

    }

    this.state.data.push(obj)
//把写好的数据传入db.json
        fetch("http://localhost:3000/user", {
          method: "POST",
          body: JSON.stringify({
            ...obj,
          }),
          headers: {
            "content-type": "application/json"
          }
        })
          .then(response => response.json())
          .then(res => {
            console.log(res);

          });
//

    this.setState({

      visible: false,
    });
  };

  handleCancel = e => {
    console.log(e);
    this.setState({
      visible: false,
    });
  };

}