我想找到页面中所有 bubble 类的元素，并让它们向随机方向移动一段距离，请教应该怎么写？
本人小白，看不懂文档，求求了
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一两句话教不会你，转变一下思维，小程序没有dom，不要妄想操作dom。
简单的利用css动画去做，复杂的用wx.createAnimation去做
这样为什么不行呀