A series of short, heavily annotated JavaScript programs. （一个简短丰富注释的项目）

• By Mary Rose Cook
• http://maryrosecook.com
• [email protected]

Demonstrates an animation loop, collision detection, keyboard input, drawing to the canvas and playing sounds. （演示动画循环、碰撞检测、键盘输入、画布绘图和播放声音。）

To read the annotated source, open /space-invaders/docs/space-invaders.html in your browser. （阅读注释源码， 在浏览器打开 /space-invaders/docs/space-invaders.html）

Demonstrates some simple trig that calculates the movement of circles as they bounce off lines. （演示一些简单的三角函数，当圆从直线上弹回时，计算圆的运动。）

To read the annotated source, open /circles-bouncing-off-lines/docs/circles-bouncing-off-lines.html in your browser.