React年月日时分秒倒计时实现

清疚 2022-03-18 10:22 519阅读 0赞

组件的实现

import React, {Component} from 'react'
    
    export default class CountTimeDown extends Component {
      constructor(props) {
        super(props);
        this.state = {
          day: 0,
          hour: 0,
          minute: 0,
          second: 0
        }
      }
    
      componentDidMount() {
        if (this.props.endTime) {
          let endTime = this.props.endTime.replace(/-/g, "/");
          this.countFun(endTime);
        }
      }
    
      //组件卸载取消倒计时
      componentWillUnmount() {
        clearInterval(this.timer);
      }
    
      countFun = (time) => {
        let end_time = new Date(time).getTime(),
          sys_second = (end_time - new Date().getTime());
        this.timer = setInterval(() => {
          //防止倒计时出现负数
          if (sys_second > 1000) {
            sys_second -= 1000;
            let day = Math.floor((sys_second / 1000 / 3600) / 24);
            let hour = Math.floor((sys_second / 1000 / 3600) % 24);
            let minute = Math.floor((sys_second / 1000 / 60) % 60);
            let second = Math.floor(sys_second / 1000 % 60);
            this.setState({
              day: day,
              hour: hour < 10 ? "0" + hour : hour,
              minute: minute < 10 ? "0" + minute : minute,
              second: second < 10 ? "0" + second : second
            })
          } else {
            clearInterval(this.timer);
          }
        }, 1000);
      };
    
      render() {
        return (
          <span>{this.state.minute}分{this.state.second}秒</span>
        )
      }
    }

使用组件

/**
       * 倒计时实现
       * @constructor
       */
      Minutes = () => {
        let date = new Date();
        let min = date.getMinutes();
        date.setMinutes(min + 30);
        let newdate = date.toLocaleString('chinese', {hour12: false});   //获取24小时制，中国时间，打印出   2019/01/03/  08:40:32
        console.log(newdate);
        this.setState({
          date: newdate,
        });
      };