js封装实时时间显示及显示今天是周几

//封装当前时间方法
function havetime(unixtime) {
    var date = new Date(unixtime);
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    var d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    var h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    var minute = date.getMinutes();
    var second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d + ' ' + h + ':' + minute + ':' + second;//年月日时分秒
    // return y + '-' + m + '-' + d + ' ' + h + ':' + minute;
}

function etime() {
    var timestamp = new Date().getTime()
    var time = havetime(timestamp)
    var week = new Date(timestamp).getDay()  //getDay()当前为周几
    switch (week) {
        case 0:
            week = '星期日'
            break ;
        case 1:
            week = '星期一'
            break;
        case 2:
            week = '星期二'
            break;
        case 3:
            week = '星期三'
            break;
        case 4:
            week = '星期四'
            break;
        case 5:
            week = '星期五'
            break;
        case 6:
            week = '星期六'
            break;
    }
    document.getElementById('time-day').innerHTML = time.split(' ')[0]
    document.getElementById('time-hour').innerHTML = time.split(' ')[1]
    document.getElementById('time-week').innerHTML = week
    if (time.split(' ')[1] == '06:00') {
        biao1()
        biao2()
    }
}

//间隔一秒刷新一次
setInterval(function(){
    etime()
},1000)