浏览器对象 BOM

返回当前网页地址

function currentURL() {
  return window.location.href
}

获取滚动条位置

function getScrollPosition(el = window) {
  return {
    x: (el.pageXOffset !== undefined) ? el.pageXOffset : el.scrollLeft,
    y: (el.pageYOffset !== undefined) ? el.pageYOffset : el.scrollTop
  }
}

获取url中的参数

function getURLParameters(url) {
  return url.match(/([^?=&]+)(=([^&]*))/g).reduce(
    (a, v) => (a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1), a), {}
  )
}

页面跳转，是否记录在history中

function redirect(url, asLink = true) {
  asLink ? window.location.href = url : window.location.replace(url)
}

滚动条回到顶部动画

function scrollToTop() {
  const scrollTop = document.documentElement.scrollTop || document.body.scrollTop
  if (scrollTop > 0) {
    window.requestAnimationFrame(scrollToTop)
    window.scrollTo(0, c - c / 8)
  } else {
    window.cancelAnimationFrame(scrollToTop)
  }
}

复制文本

function copy(str) {
  const el = document.createElement('textarea')
  el.value = str
  el.setAttribute('readonly', '')
  el.style.position = 'absolute'
  el.style.left = '-9999px'
  el.style.top = '-9999px'
  document.body.appendChild(el)
  const selected = document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false
  el.select()
  document.execCommand('copy')
  document.body.removeChild(el)
  if (selected) {
    document.getSelection().removeAllRanges()
    document.getSelection().addRange(selected)
  }
}

检测设备类型

function detectDeviceType() {
  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ? 'Mobile' : 'Desktop'
}