你看的时间太长了

You see it too long time.
当前为 2019-10-29 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 0.0.10
// @author 稻米鼠
// @description You see it too long time.
// @run-at document-idle
// @homepage https://meta.appinn.net/t/11501
// @supportURL https://meta.appinn.com/t/11501
// @match *://*/*
// @noframes
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_deleteValue
// @grant GM_listValues
// ==/UserScript==

// 模式 0：限制总观看时间；模式 1：限制每个网站观看时间
const youSeeItTooLongTimeMode = 0
// 最大观看时长，单位：分钟
const howMinutesCanYouWatchIt = 60
/* 以下无需修改 */
const oldLoadFun = window.onload
window.onload = async function(){
  oldLoadFun && oldLoadFun()
  // 获取当前所需时间对象
  const getNow = ()=>{
    const nowUTC = new Date()
    const now = Number((+nowUTC/1000).toFixed()) - nowUTC.getTimezoneOffset()*60
    const day = now - now%86400
    return { now, day }
  }
  // 储存当前数据
  const storeData = async (long)=>{
    GM_setValue(window.location.hostname, JSON.stringify({
      day: start.day,
      long: long
    }))
  }
  // 获取存储的数据
  const getData = async (key=window.location.hostname)=>{
    if(GM_getValue(key)){
      try {
        const temp = JSON.parse(GM_getValue(key))
        // 如果有合理的数据，并且是当天数据
        if(temp.day && temp.day === start.day && temp.long){
          return temp
        }
      } catch (error) {
        
      }
    }
    return false
  }
  // 修改网页标题
  const changeTitle = title=>{
    document.title = title+document.title.replace(/^【[\d:-]+】/i, '')
  }
  // 两位数字
  const dbNum = num=>{
    return num<10 ? '0'+num : num
  }
  // 窗口是否最小化
  const isMin = ()=>{
    let isWinMin = false;
    if (window.outerWidth != undefined) {
        isWinMin = window.outerWidth <= 160 && window.outerHeight <= 27;
    } else {
        isWinMin = window.screenTop < -30000 && window.screenLeft < -30000;
    }
    return isWinMin;
  }
  // 处理 hash 指令
  const hashCommand = async (hash, max)=>{
    if(/^#clear$/i.test(hash)){
      await storeData( 0 )
      window.location.hash = ''
      return
    }
    if(/^#clearAll$/i.test(hash)){
      const keys = await GM_listValues()
      for (let key of keys) {
        GM_deleteValue(key);
      }
      window.location.hash = ''
      return
    }
    if(/^#close$/i.test(hash)){
      await storeData( 1.25*max )
      window.location.hash = ''
      return
    }
    if(/^#add\d+$/i.test(hash)){
      let add = +hash.replace(/^#add(\d+)$/, '$1')
      add = isNaN(add) ? 0 : add*60
      const siteData = await getData()
      let historyLong = siteData ? siteData.long : 0
      historyLong = historyLong<add ? 0 : historyLong-add
      await storeData(historyLong)
      window.location.hash = ''
      return
    }
    if(/^#sub\d+$/i.test(hash)){
      let sub = +hash.replace(/^#sub(\d+)$/, '$1')
      sub = isNaN(sub) ? 0 : sub*60
      const siteData = await getData()
      let historyLong = siteData ? siteData.long : 0
      historyLong = historyLong+sub
      await storeData(historyLong)
      window.location.hash = ''
      return
    }
  }
  // 时间更新
  const refreshTime = async ()=>{
    const n = getNow()  // 获取当前时间
    // 如果页面在后台或者窗口最小化，仅更新起始对象中的最后更新时间
    if(document.visibilityState !== 'visible' || isMin()){
      start.lastTime = n.now
      return
    }
    // 检测指令
    await hashCommand(window.location.hash, maxLong)
    // 如果是当天
    const siteData = await getData()
    start.historyLong = n.day === start.day
                        ? (siteData ? siteData.long : 0) + n.now - start.lastTime
                        : n.now%86400
    start.day = n.day
    start.lastTime = n.now
    await storeData(start.historyLong)

    let lastTime = maxLong
    if(youSeeItTooLongTimeMode){
      lastTime = maxLong - start.historyLong
    }else{
      const keys = await GM_listValues()
      for (let key of keys) {
        const m = await getData(key)
        this.console.log(m)
        if(m.day === start.day){
          lastTime -= m.long
        }else{
          m && GM_deleteValue(key);
        }
      }
    }
    if(lastTime < 0){
      const alpha = 1 + 4*lastTime/maxLong
      const opacity = ( alpha>1 ? 1 : ( alpha<0 ? 0 : alpha ) ).toFixed(2)
      document.querySelector('body').style.opacity = opacity
      if(document.fullscreenElement){// 如果全屏
        document.fullscreenElement.style.opacity = opacity
      }
      if(alpha<0){
        if(document.fullscreenElement){ document.exitFullscreen() } // 如果全屏则退出
        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'
        document.querySelector('html').style.backgroundAttachment = 'fixed'
        window.clearInterval(timer)
      }
    }
    const lastTimeToShow = (lastTime>=0 ? '' : '-')
                          + dbNum( Math.floor( Math.abs(lastTime)/60) )
                          + ':'
                          + dbNum( Math.abs(lastTime)%60 )
    changeTitle('【'+lastTimeToShow+'】')
  }
  // 初始化 启动程序
  const start = getNow()
  const siteData = await getData()
  start.lastTime = start.now
  start.historyLong = siteData ? siteData.long : 0
  const maxLong = isNaN(howMinutesCanYouWatchIt) ? 3600 : howMinutesCanYouWatchIt*60
  await storeData( start.historyLong )

  refreshTime()
  const timer = window.setInterval(refreshTime, 1e3)
}
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