雪花运动轨迹的解析
// 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;
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