最近在网上看到一个用脚本画线的事例，感觉写的不错，非常的精炼！运行起来效果也不错，在这里把这个小事例发给大家！参考一下。

　　脚本如下（都写在图层一的第一帧上）：

var linesize:UInt =2;
var isDown:Boolean =false;
var oldX:Number;
var oldY:Number;

stage.addEventListener(MouseEvent.MOUSE_DOWN ,onDown);
stage.addEventListener(MouseEvent.MOUSE_UP ,onUp);
stage.addEventListener(MouseEvent.MOUSE_MOVE ,onMove);

function onDown(event:MouseEvent):void {
isDown=true;
oldX =mouseX;
oldY =mouseY;
}

function onMove(event:MouseEvent):void {
if (isDown) {
   graphics.lineStyle(linesize,0x00ff00);
   graphics.moveTo(oldX,oldY);
   graphics.lineTo(mouseX,mouseY);
   oldX=mouseX;
   oldY=mouseY;
}
}

function onUp(event:MouseEvent):void {
isDown=false;
}