function dateTime()
{
    var date = new Date(); //日期对象
    var now = "";
    now += date.getFullYear() + "年"; //读英文就行了
    now += (date.getMonth() + 1) + "月"; //取月的时候取的是当前月-1如果想取当前月+1就可以了
    now += date.getDate() + "日 ";
    if (date.getHours() > 4 && date.getHours() < 12) {
        now += "上午";
    }
    if (date.getHours() > 12 && date.getHours() < 20) {
        now += "下午";
    }
    if (date.getHours() > 20 && date.getHours() < 4) {
        now += "晚上";
    }
    if (date.getHours() < 10) {
        now += "0";
    }
    else {
        now += "";
    }
    now += date.getHours();
    if (date.getMinutes() < 10) {
        now += ":0";
    }
    else {
        now += ":";
    }
    now += date.getMinutes();
    //now = now + date.getSeconds()+"秒";
    //alert(now);
    document.getElementById("dateTime").innerHTML = now;
    setTimeout("dateTime()", 1000); //设置过1000毫秒就是1秒，调用show方法
}
window.onload = dateTime;