Question

求as3.0高手，这段as2代码如何改为as3？？

dragger.onRelease = function() {
stopDrag();
delete this.onEnterFrame;
};
btnup.onPress = function() {
this.onEnterFrame = function() {
//技巧
dragger.y = Math.max(top, dragger.y-moveSpeed);
updateContentPos();
};

Answer 1

dragger.addEventListener(MouseEvent.CLICK,on_click);

btnup.addEventListener(MouseEvent.CLICK,on_press);

function on_press(e:MouseEvent)
{
addEventListener(Event.ENTER_FRAME,on_enterFrame);
}
function on_click(e:MouseEvent)
{
stopDrag();
removeEventListener(Event.ENTER_FRAME,on_enterFrame);
}

function on_enterFrame(e:Event)
{
dragger.y = Math.max(top, dragger.y-moveSpeed);
updateContentPos();
}

追问

dragger.addEventListener(MouseEvent.CLICK,on_click);中的on_click是怎么出来的？
如果是btnup.onRelease = function() {
delete this.onEnterFrame;
}btndown.onPress = function(){
this.onEnterFrame = function() {
dragger.y = Math.min(bottom, dragger.y+moveSpeed);
updateContentPos();
};
}
btndown.onRelease = function() {
delete this.onEnterFrame;
};是一样的道理吗

追答

on_click 是自定义的函数啊。
它的函数体

function on_click(e:MouseEvent)
{
stopDrag();
removeEventListener(Event.ENTER_FRAME,on_enterFrame);
}

另外on_enterFrame也是，名称没有什么特别意义。

btndown.onPress = function(){……}

btndown.onRelease = function() {……}

一个按钮注册两种鼠标点击事件，会冲突的。