用迭代算法实现动态逼近效果，最终实现颤动的小水珠，代码很简单，但是很有意思，只要修改一下，就可以制作出很漂亮的按钮-using iterative approximation algorithm dynamic effects, and eventually realizing the quiver of small globs, the code is very simple. However, it is very interesting, as long as the changes th