ͨĹƶʱȥӲôȥһأϻ壡ȥǳ 

ֻܹԪһ̬ıΪʹְ嶼Ƕˣ 
1飬ʵmove_bar 
2һԪʾĴСʵmask 
3̬ıʵΪtxt 
Ǵ룬дϾˡ

//ȶ廬ƶΧ  
barUp = 67;  
barDown = 204;  
barPos = 446;   
//Ȼǻĳ̶ȣٶֵԽ󻺳Խ  
speed = 6;  
//ȻǼҲǻۺݵĿƶ֮  
prop = (txt._height-mask._height)/(barDown-barUp);  
//¼ݵλ  
txtOrigin = txt._y;  
//ڻϰµʱʼ϶downжǷ϶  
move_bar.onPress = function() {  
 move_bar.startDrag(0, barPos, barUp, barPos, barDown);  
 down = 1;  
};  
//ɿʱֹͣ϶downΪ0  
move_bar.onMouseUp = function() {  
 move_bar.stopDrag();  
 down = 0;  
};  
//ǹؼenterFrameif(down)Ҳ϶ʱִͣifĳ  
this.onEnterFrame = function() {  
 if (down) {  
  //ʱyֵȥޣƶľ룬֮ǰı͵õıӦƶľ  
  txtMove = (move_bar._y-barUp)*prop;  
//ԭλüȥ룬õıӦڵλãҲĿλ  
  txt.m_y = txtOrigin-txtMove;  
 }  
//ıyֵÿһα仯=Ŀλ-ǰλãԻٶȡעһ䲻ܷifѭ棬һɿֹͣ  
 txt._y += (txt.m_y-txt._y)/speed;  
}; 
OK, һ,ǰһ㣨õ48ȥЧ뿼ԣʹطʱֻҪһ»ķΧøԪʵͿ