(react)获取json数据与传入(antd配合)

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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,
    });
  };
     
}