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bug重现步骤:
1.在balls div中点击一个ball,再点击这个lucky ball(起个名字为Green),使之移动到lucky-balls div中
2.在lucky-balls div 点击这个Green的ball(Green为最后一个ball)
3.随即在balls div中点击一个ball,再点击这个lucky ball
4.lucky-balls div中为会出现2个ball(刚刚的lucky ball和Green)