SOURCE

title = document.title;
function showTime() {
    d = new Date();
    time = myfun(d.getHours()) + ":" + myfun(d.getMinutes()) + ":" + myfun(d.getSeconds());
    //在标题栏中显示动态时间
    document.title = title + " - " + time;
    //在状态栏中显示动态时间
    window.status = "状态栏中的时间为:" + time;
}
//这个方法是在个位数前加0
function myfun(op){
    if(op<10){
        op='0'+op;
    }
    return op;
}
setInterval("showTime()", 1000);