不懂这里是怎么计算的，为什么要乘以500，5000
endPositionLeft = startPositionLeft - 100 + Math.random() * 500,
duration = visualHeight * 10 + Math.random() * 5000;
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endPositionLeft = startPositionLeft - 100 + Math.random() * 500,
duration = visualHeight * 10 + Math.random() * 5000;
2018-08-22
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