function counter() {

    var date = new Date();

    var year = date.getFullYear();

    var date2 = new Date(year, 12, 31, 23, 59, 59);

    /*转换成秒*/
    var time = (date2 - date) / 1000;

    var day = Math.floor(time / (24 * 60 * 60))


    var hour = Math.floor(time % (24 * 60 * 60) / (60 * 60))

    var minute = Math.floor(time % (24 * 60 * 60) % (60 * 60) / 60);

    var second = Math.floor(time % (24 * 60 * 60) % (60 * 60) % 60);

    var str = year + "年还剩" + day + "天" + hour + "时" + minute + "分" + second + "秒";

    console.log(str);

}

window.setInterval(counter(), 1000);