以下几组代码是什么意思 flash中用的

代码1stop();fr.onEnterFrame = function() { if (_xmouse<100) { this._x = this._x-(this._x-100)*0.2;} else if (_xmouse>500) { this._x = this._x-(this._x-500)*0.2;} else { this._x = this._x-(this._x-_xmouse)*0.2;}};代码2on (release) { _parent.screen.gotoAndPlay(2);_parent.screen.auto.gotoAndStop(1);}代码3startDrag(_root.xin, true);x = getProperty(_root.xin, _x);y = getProperty(_root.xin, _y);代码4on (release) { stopDrag();}on (press) { startDrag("xin");}另外如果有知道的人麻烦告诉我一下如何学习flash的代码并灵活掌握 收起