你看的时间太长了

You see it too long time.
当前为 2019-09-05 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name 你看的时间太长了
// @namespace You see it too long time.
// @version 0.0.1
// @author 稻米鼠
// @description You see it too long time.
// @run-at document-idle
// @homepage https://meta.appinn.net/t/topic/11501
// @supportURL https://meta.appinn.com/t/9230
// @match *://*/*
// ==/UserScript==

const oldLoadFun = window.onload
window.onload=function(){
  oldLoadFun && oldLoadFun()
  // 获取当前所需时间对象
  const getNow = ()=>{
    const now = Number( new Date() )
    const day = now - now%864e5
    return { now, day }
  }
  // 初始化
  const start = getNow()
  let historyLong = 0
  const maxLong = 36e5
  // 储存当前数据
  const storeData = (long)=>{
    const todayYouSeeItHowLong = {
      day: start.day,
      long: long
    }
    localStorage.setItem('todayYouSeeItHowLong', JSON.stringify(todayYouSeeItHowLong))
  }
  // 如果存在数据
  if(localStorage.getItem('todayYouSeeItHowLong')){
    try {
      const temp = JSON.parse(localStorage.getItem('todayYouSeeItHowLong'))
      // 如果有合理的数据，并且是当天数据
      if(temp.day && temp.day === start.day && temp.long){
        historyLong = temp.long
      }else{
        storeData(0)
      }
    } catch (error) {
      storeData(0)
    }
  } else {
    storeData(0)
  }
  window.setInterval(()=>{
    const n = getNow()
    if(n.day === start.day){
      historyLong += n.now - (start.lastTime ? start.lastTime : start.now)
      start.lastTime = n.now
    }else{
      start.day = n.day
      historyLong = n.now%864e5
      start.lastTime = n.now
    }
    storeData(historyLong)
    if(historyLong >= maxLong){
      const alpha = 1 - 4*(historyLong-maxLong)/maxLong
      document.querySelector('body').style.opacity = ( alpha>1 ? 1 : ( alpha<0 ? 0 : alpha ) ).toFixed(2)
      if(alpha<0){
        document.querySelector('html').style.backgroundImage = 'url("https://i.v2ex.co/WJ15n12m.png")'
        document.querySelector('html').style.backgroundPosition = 'center top'
        document.querySelector('html').style.backgroundRepeat = 'no-repeat'
      }
    }
  }, 1e3)
}