util中写个js方法

// 取当前时间的前一个周四
export const getThursday = () => {
  let now = new Date();
  let nowTime = now.getTime();
  let today = now.getDay(); // 今天是星期几
  let oneDayLong = 24*60*60*1000;
  // 周五周六周日，展示本周四
  let nowDay1 = new Date(nowTime - (today-4)*oneDayLong);
  let year1 = nowDay1.getFullYear();
  let month1 = nowDay1.getMonth()+1;
  let day1 = nowDay1.getDate();
  // 周一-周四，展示上周四
  let nowDay2 = new Date(nowTime - (today+3)*oneDayLong);
  let year2 = nowDay2.getFullYear();
  let month2 = nowDay2.getMonth()+1;
  let day2 = nowDay2.getDate();

  let date = '';
  if(today > 4 || today === 0) {
    if(day1 < 10) {
      date = year1 + '-' + month1 + '-' + '0' + day1;
    } else {
      date = year1 + '-' + month1 + '-' + day1;
    }
  } else {
    if(day2 < 10) {
      date = year2 + '-' + month2 + '-' + '0' + day2;
    } else {
      date = year2 + '-' + month2 + '-' + day2;
    }
  }
  return date;
}

页面中引用
（多的不写了，在react中实现的）

// 头
import { DatePicker } from 'antd';
import * as util from '../../crm-assets/js/utils.js';
const { RangePicker } = DatePicker;
const dateFormat = 'YYYY-MM-DD';

// constructor函数，默认时间
constructor(props) {
	super(props);
	this.state = {
		dateDefault: [moment(util.getThursday(), dateFormat), moment(util.getThursday(), dateFormat)],
	}
}

// componentDidMount默认渲染
componentDidMount() {
	moment.locale('zh-cn',{
       day: {
           dow: 5,
       },
	});
	this.getData();
}

// 传值，getTable调用接口并返回
getData = async () => {
	let date = util.getThursday();
    this.setState({
        startTime: date,
		endTime: date,
    },()=>{
		this.getTable();
    });
}

render() {
	const { dateDefault } = this.state
	return (<>
		<RangePicker className='lob-select' onChange={this.changeDate} defaultValue={dateDefault} allowClear={false}/>
	</>)
}

今天是2020/12/18，星期五，前一个周四是昨天。选择器默认展示：