React Native验证码倒计时工具类分享

/** * Created by zhuang.haipeng on 2017.9.11 * * 广告倒计时,验证码倒计时工具类 * * 用法: //60 * 1000 为60秒 , 60 * 60 * 100 为60分钟 ... * let countdownDate = new Date(new Date().getTime() + 60 * 1000) *  CountdownUtil.settimer(countdownDate, (time) => { *   Console.log(time) --> {years: 0, days: 0, hours: 0, min: 0, sec: 49, millisec: 0} *  } * *  切记: 在应用工具类的页面退出的时候, 调用CountdownUtil.stop() 清除定时器,以免内存爆了 */export default class CountdownUtil {  /** 定时器 */  interval = null;  /**   * 创建定时器   *   */  static settimer(countdownDate, callbak) {    this.interval = setInterval(() => {      let time = this.getDateData(countdownDate)      callbak && callbak(time)    }, 1000)  }  /**   * 侄计时计算 --> 通过此方法计算,可以解决应用退出后台的时候,定时器不走   * @param countdownDate   * @return {*}   */  static getDateData(countdownDate) {    let diff = (Date.parse(new Date(countdownDate)) - Date.parse(new Date)) / 1000;    if (diff <= 0) {     this.stop() // 倒计时为0的时候, 将计时器清除      return 0;    }    const timeLeft = {      years: 0,      days: 0,      hours: 0,      min: 0,      sec: 0,      millisec: 0,    };    if (diff >= (365.25 * 86400)) {      timeLeft.years = Math.floor(diff / (365.25 * 86400));      diff -= timeLeft.years * 365.25 * 86400;    }    if (diff >= 86400) {      timeLeft.days = Math.floor(diff / 86400);      diff -= timeLeft.days * 86400;    }    if (diff >= 3600) {      timeLeft.hours = Math.floor(diff / 3600);      diff -= timeLeft.hours * 3600;    }    if (diff >= 60) {      timeLeft.min = Math.floor(diff / 60);      diff -= timeLeft.min * 60;    }    timeLeft.sec = diff;    return timeLeft;  }  /**   * 数字补零 --> 例: 00时01分59秒   * @param num   * @param length   * @return {*}   */  static leadingZeros(num, length = null) {    let length_ = length;    let num_ = num;    if (length_ === null) {      length_ = 2;    }    num_ = String(num_);    while (num_.length < length_) {      num_ = '0' + num_;    }    return num_;  }  /** 清除定时器 */  static stop() {    clearInterval(this.interval);  }};

 if (this.state.isSentVerify === true) {      // 倒计时时间      let countdownDate = new Date(new Date().getTime() + 60 * 1000)      // 点击之后验证码不能发送网络请求      this.setState({        isSentVerify: false      });      Api.userRegisterCheckCode(this.state.phoneText)        .then(          (data) => { // 倒计时时间            CountdownUtil.settimer(countdownDate, (time) => {              this.setState({                timerTitle: time.sec > 0 ? time.sec + 's' : '重新获取'              }, () => {                if (this.state.timerTitle == "重新获取") {                  this.setState({                    isSentVerify: true                  })                }              })            })          }        ).catch((err) => {        this.setState({          isSentVerify: true,        })      });    }

 componentWillUnmount() {    CountdownUtil.stop()  }