var myTimer:Timer = new Timer(1000);
myTimer.addEventListener(TimerEvent.TIMER,time);
myTimer.start();

function init(){
    var current:Date = new Date();
    var year:Number = current.getFullYear();
    var month:Number = current.getMonth()+1;
    var date:Number = current.getDate();
    var day:Number = current.getDay();
    var dayArray:Array = ["日","一","二","三","四","五","六"];
    date_txt.text = year + "年" + month + "月" + date + "日 " + "星期" + dayArray[day];

    var hours:Number = current.getHours();
    var minutes:Number = current.getMinutes();
    var seconds:Number = current.getSeconds();
    time_txt.text = hours + "点" + minutes + "分" + seconds + "秒";
}
init();

function time(event:TimerEvent):void {
       init()
}

<ul class="nav">
     <li><a href="#">日志</a>
         <ul class="sub_nav">
            <li><a href="#">As3</a></li>
            <li><a href="#">photoshop</a></li>
            <li><a href="#">jquery</a></li>
            <li><a href="#">javascript</a></li>
            <li><a href="#">交互设计</a></li>
            <li><a href="#">Css(3)\xhtml\html5</a></li>
         </ul>
     </li>
  ...

var myText:String = "这是flash as3打字机效果，这里的文字会像打字机一样一个一个打出来。";
var txtField:TextField = new TextField();
addChild(txtField);
txtField.x = 50;
txtField.y = 20;
txtField.textColor = 0xf669900;
txtField.width = 200;
txtField.multiline = true;//multiline属性设置文本对象是否支持多行显示文本，默认为false，要使用多行文本，需要将该属性的值设置为true；
txtField.wordWrap = true;//wordWrap属性设置文本对象是否支持自动换行，默认为false，要使用自动换行，需要该属性的值设置为true；

var count:Number = 0;
addEventListener(Event.ENTER_FRAME,typeText);
function typeText(event:Event):void {
    count++;
    txtField.text = myText.substring(0, count);
    if (myText.length<count) {
        removeEventListener(Event.ENTER_FRAME,typeText);
    }
}