JS即时显示当前时间

function CheckTimer() {
    var str = document.getElementById("DateTimer");

    var timer = new Date();

    var year = timer.getFullYear();

    var mouth = timer.getMonth()+1;

    var date = timer.getDate();

    var hour = timer.getHours();

    var mitu = timer.getMinutes();

    var se = timer.getSeconds();

    str.innerHTML = year + "-" + mouth + "-" + date + "   " + hour + ":" + mitu + ":" + se;

}
setInterval(CheckTimer, 1000);//每隔一秒调用CheckTimer函数