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旋转时有个角度计算bug

css+js做的抽奖界面有个bug
原代码:
let rotateItemDeg = (res.location - 1) * (360 / this.lottery.length);
应改为:
let rotateItemDeg = (7 - res.location) * (360 / this.lottery.length);
这个地方会导致后台计算的奖品和前端显示的不符，原因在于奖品旋转的角度不对，举例位置2的奖品应旋转300度，原代码里转了30度
感谢po主这么简洁好看的抽奖界面，我不太会前端在这上面做修改省了很多事，帮您修正一下其他人若需要了可以修改这一处～

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