获取任意变量的类型

const isType = (param) => {
  return typeof param !== "object" ? typeof param : Object.prototype.toString.call(param).slice(8, -1).toLowerCase();
};

防抖函数

const debounce = (() => {
  let timer = null;
  return (callback, wait = 800) => {
    timer && clearTimeout(timer);
    timer = setTimeout(callback, wait);
  };
})();
// 使用
Btn.onclick = () => {
  debonce(() => {
    console.log("事件触发");
  }, 800);
};

手机号中间加*

const hideMobile = (mobile) => {
  return mobile.replace(/^(\d{3})\d{4}(\d{4})$/, "$1****$2");
};

将页面缓慢的滚动到顶部

const scrollToTop = () => {
  const height = document.documentElement.scrollTop || document.body.scrollTop;
  if (height > 0) {
    window.requestAnimationFrame(scrollToTop);
    window.scrollTo(0, height - height / 8);
  }
};

滚动到指定元素位置

const smoothScroll = (element) => {
  document.querySelector(element).scrollIntoView({
    behavior: "smooth",
  });
};

金额格式化

 const moneyFormat = (number, decimals, dec_point, thousands_sep) => {
  number = (number + '').replace(/[^0-9+-Ee.]/g, '')
  const n = !isFinite(+number) ? 0 : +number
  const prec = !isFinite(+decimals) ? 2 : Math.abs(decimals)
  const sep = typeof thousands_sep === 'undefined' ? ',' : thousands_sep
  const dec = typeof dec_point === 'undefined' ? '.' : dec_point
  let s = ''
  const toFixedFix = function(n, prec) {
    const k = Math.pow(10, prec)
    return '' + Math.ceil(n * k) / k
  }
  s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.')
  const re = /(-?\d+)(\d{3})/
  while (re.test(s[0])) {
    s[0] = s[0].replace(re, '$1' + sep + '$2')
  }

  if ((s[1] || '').length < prec) {
    s[1] = s[1] || ''
    s[1] += new Array(prec - s[1].length + 1).join('0')
  }
  return s.join(dec)
}

存储操作

class MyCache {
  constructor(isLocal = true) {
    this.storage = isLocal ? localStorage : sessionStorage
  }

  setItem(key, value) {
    if (typeof (value) === 'object') value = JSON.stringify(value)
    this.storage.setItem(key, value)
  }

  getItem(key) {
    try {
      return JSON.parse(this.storage.getItem(key))
    } catch (err) {
      return this.storage.getItem(key)
    }
  }

  removeItem(key) {
    this.storage.removeItem(key)
  }

  clear() {
    this.storage.clear()
  }

  key(index) {
    return this.storage.key(index)
  }

  length() {
    return this.storage.length
  }
}

const localCache = new MyCache()
const sessionCache = new MyCache(false)
export { localCache, sessionCache }

部分工具函数来源：呛再首 https://juejin.cn/post/7132714583399071758