函数是初等数学的重要内容之一.周期性是周期函数的重要性质之一.因此,掌握好函数的周期性是透彻理解教材和正确认识周期函数的关键.下面就周期的理解,周期的求法,周期的证明谈一下自己的观点和做法.1对周期的理解1)定义诠释①f(x+T)=f(x)要使x取定义域中每一个值都成立.②周期 Function is one of the important contents of elementary mathematics.Cyclicality is one of the important properties of periodic function.Therefore, to master the periodicity of the function is the key to understanding the teaching material and understanding the periodic function correctly.The following is the understanding of the cycle, the cycle of the method , The cycle of proof to talk about their own views and practices.1 understanding of the cycle 1) the definition of the definition of f (x + T) = f (x)