产生一个随机数定义位置定义一个数组，用来存放随机编号，使Image响应鼠标事件，来改变图片位置。
Location to generate a random number define the definition of an array used to store random Numbers, so image respond to mouse events, to change the image location.
它其实是一个游戏,允许你产生一个随机数,我们叫它伪随机数,能够高效地转动骰子，so，that，scratch，can，effectively，roll,或者抛掷一枚硬币，或者给你一个不确定结果。
Oh, it turns out there's a puzzle piece that allows you to pick a random or as we'll start calling it soon a pseudorandom number scratch a dice or flip a coin, or give you a bit of non-determinism.
换句话说，就是重复利用巴恩·斯利蕨类公式所产生的随机数可以形成一个蕨类形状的独特物体。
In other words, random Numbers generated over and over using Barnsley's fern formula ultimately produce a unique fern-shaped object.
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