[HTML/CSS/JS] 统计用户停留网站时长

• 用户一进来，记录用户进入页面的开始时间；
• 用户在新的标签页打开页面，如果其他标签页已经打开了页面，这时候的开始时间还是算第一次进入的页面的时间；
• 用户关闭该网页的全部标签页时，需要记录关闭的结束时间，调用接口传数据给后台；  b% j5 O# v9 E& u# e/ ^
  

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window.addEventListener("load",function(){
    if(sessionStorage.getItem("flag")){
        return;
    }
    sessionStorage.setItem("flag", true);
})

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window.addEventListener("load",function(){
    let nowTime = getNowTime()
    let openPageCount = localStorage.getItem("openPageCount")
    openPageCount += 1
    localStorage.setItem("openPageCount",openPageCount)
    //其实说明是页面是刷新后加载的，不应该统计开始时间
    if(sessionStorage.getItem("flag")){
        return;
    }
    localStorage.setItem("startTime",nowTime)
    sessionStorage.setItem("flag", true);
})

window.addEventListener("beforeunload",function(){
    let nowTime = getNowTime()
    let openPageCount = localStorage.getItem("openPageCount")
    openPageCount -= 1
    localStorage.setItem("endTime",nowTime)
    localStorage.setItem("openPageCount",openPageCount)
    if(openPageCount == 0){
        //说明页面全部关闭，这时候可以传数据给后台
    }
})

function getNowTime(){
    let nowTime = new Date().getTime()
    return nowTime
}

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window.addEventListener("load",function(){
    let nowTime = getNowTime()
    let openPageCount = localStorage.getItem("openPageCount")
    openPageCount = openPageCount ? parseInt(openPageCount) : 0
    openPageCount += 1
    localStorage.setItem("openPageCount",openPageCount)
    refreshTime()
    let isRightTime =  compareRefreshTime()
    //其实说明是页面是刷新后加载的，不需要统计开始时间
    if(sessionStorage.getItem("flag") && isRightTime){
        return;
    }
    localStorage.setItem("startTime",nowTime)
    localStorage.setItem("refreshTime",nowTime)
    sessionStorage.setItem("flag", true);
})

window.addEventListener("beforeunload",function(){
    let nowTime = getNowTime()
    let openPageCount = localStorage.getItem("openPageCount")
    openPageCount -= 1
    localStorage.setItem("endTime",nowTime)
    localStorage.setItem("openPageCount",openPageCount)
    if(openPageCount == 0){
        //说明页面全部关闭，这时候可以传数据给后台
    }
})

function getNowTime(){
    let nowTime = new Date().getTime()
    return nowTime
}

function compareRefreshTime(){
   let nowTime = getNowTime()
   let refreshTime = localStorage.getItem("refreshTime")
   return nowTime - refreshTime < 60 * 1000
}

function refreshTime(){
    setTimeout(refreshTime ,30 * 1000)
    let nowTime = getNowTime()
    localStorage.setItem("refreshTime",nowTime)
}