好用的(TypeScript)工具函数

格式化时间

export const formatTime = (date: Date) => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return (
    [year, month, day].map(formatNumber).join('/') +
    ' ' +
    [hour, minute, second].map(formatNumber).join(':')
  )
}

const formatNumber = (n: number) => {
  const s = n.toString()
  return s[1] ? s : '0' + s
}

计算2个日期之间相差多少天

export function dayDif(date1: Date, date2: Date): number {
    return Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000);
}

节流

export const throttle = (cb, wait = 3000) =>{
  let previous = 0;
  return function (...args) {
    const nowDate = +new Date();
    if( nowDate - previous > wait ){
      previous = nowDate;
      cb.apply(this, args);
    }
  }
}

防抖

export function debounce(cb, wait = 1000, immediate = false) {
  let timeout;

  return function(...args): void {
    let callNow: boolean = immediate && !timeout;

    if (timeout) clearTimeout(timeout);

    timeout = setTimeout((): void => {
      timeout = null;

      if (!immediate) cb.apply(this, args);
    }, wait);

    if (callNow) cb.apply(this, args);
  };
}