最近的几年里，B站人口一直在急剧增长，弹幕文化的大众化必然会要求弹幕功能本身的简化。现在的高级弹幕（mode 7）在被使用时常常仅仅被用来重复一句话或者几个词语，功能上更是只局限在放大字号、霸屏等夺人眼球的方面，这一方面让高级弹幕的目的被过度单一化了，另一方面这也引起了很多人对高级弹幕反感，使其更难被接受。如今仍一息尚存的mode 7弹幕尚且如此，几年前被b站封印发送权限的代码弹幕（mode 8），更是成了绝大多数B站用户无法接触的都市传说。

今天在某弹幕游戏“考古”视频里看到评论对代码弹幕功能的讨论，很多人都无法想象代码弹幕可以发送图片。我感觉既然代码弹幕仍然被保存在弹幕池里，就有必要简单一下代码弹幕能实现的基本功能。

首先，代码弹幕可以绘制直线、圆、贝塞尔曲线、矩形、圆角矩形等图线，并能在闭合路径中填充指定颜色，如果配合某位大神发布的DanmakuHelper工具，基本可以把代码弹幕的绘图功能当成残血版的AI来用。本文最底端就是我在2015年弹幕大赛里半途而废的作品（标题图里的那个未审核稿件）中的一帧画面的mode 8代码，就是使用前面提到的那个工具绘制而成，里面甚至还分了一堆图层。感兴趣的话可以把这段代码保存为txt文件，并下载一个DanmakuHelper看一看，你看到的就是代码弹幕发送到视频里的效果。

此外，代码弹幕还可以调用函数实现媒体文件的播放与暂停、视频内跳跃以及跨视频跳跃等。比如 public function jump(av:10492,page:int=1,newwindow:Boolean=false):void 这段代码，一旦被调用就会直飞AV10492的p1，把其中的false改为true就是在新窗口中打开那个页面。

至于侦测键盘输入、基本的数学相关的函数、获取屏幕分辨率并据此实时修改屏幕定位等功能，都是小意思。实际上，代码弹幕的代码是ECMAScript语言，有些类似Java、C、Perl，我没有对此进行深入研究，不过移植一些由后者编写的小游戏想必并不是什么不可能的事情。其实说实话我也是一个半吊子，基本上知道的就是这么多了，下面就是我之前提到的mode 8图片弹幕，欢迎自取。

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g.endFill();

g.lineStyle(1,11050375,1);

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g.endFill();

g.lineStyle(1,11050375,1);

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