实时时间设置

//时钟设置
function addZero(n) {
    return n < 10 ? '0' + n : '' + n;
}

function tick() {
    var today = new Date();
    var yy = today.getYear();
    if (yy < 1900) yy = yy + 1900;
    var MM = today.getMonth() + 1;
    var dd = today.getDate();
    var hh = today.getHours();
    var mm = today.getMinutes();
    var ss = today.getSeconds();
    var ww = today.getDay();
    var arr = ['日', '一', '二', '三', '四', '五', '六'];
    document.getElementById("localtime").innerHTML = "<p class='t1'>" + addZero(hh) + ":" + addZero(mm) + ":" + addZero(ss) + "</p>" + " " + "<p class='t2'>" + addZero(MM) + "月" + addZero(dd) + "日" + "<span>" + "星期" + arr[ww] + "</span>" + "</p>";
}
tick();
setInterval(tick, 1000);