Canvas放置反弹效果随机图形(实例)

Canvas放置反弹效果随机图形(实例) var raf; var arror = []; var running = false; //绘制圆形 function createBall() { return { x: 0, y: 0, vx: 10-Math.random()*10, vy: 10-Math.random()*10, radius: 25, color:"red", draw: function() { ctx.beginPath();