雪花运动轨迹的解析

源自：7-5 飘花效果的实现

// 运动的轨迹

var startPositionLeft = Math.random() * visualWidth - 100,

startOpacity = 1,

endPositionTop = visualHeight - 40,

endPositionLeft = startPositionLeft - 100 + Math.random() * 500,

duration = visualHeight * 10 + Math.random() * 5000;

提问者：吴默默 2015-12-14 15:53