var t = null;
t = setTimeout(time, 1000); //開始运行
function time() {
    
    
    clearTimeout(t); //清除定时器
    dt = new Date();
    var y = dt.getFullYear();
    var mt = dt.getMonth() + 1;
    var day = dt.getDate();
    var h = dt.getHours(); //获取时
    var m = dt.getMinutes(); //获取分
    var s = dt.getSeconds(); //获取秒
    function addzero(obj) {
    
    
        if (obj < 10) return "0" + "" + obj;
        else return obj;
    }
    mt=addzero(mt);
    day=addzero(day);
    h=addzero(h);
    m=addzero(m)
    s=addzero(s)
    document.getElementById("showTime").innerHTML = y + "-" + mt + "-" + day +' &nbsp; &nbsp; &nbsp; &nbsp;' + h + ":" + m + ":" + s ;
    t = setTimeout(time, 1000); //设定定时器，循环运行     
}