並前往https://pclevinblog.pixnet.net/blog/post/314562109-javascript-%E6%95%B8%E5%AD%B8%E9%A1%9E-%E4%BD%BF%E7%94%A8%E7%B5%95%E5%B0%8D%E5%80%BC%E5%87%BD%E6%95%B8-%E4%BD%BF%E7%94%A8math.abs%28%29