里面有两个功能函数fun1、fun2，最后在xianxingqiehuan1这个M文件里调用函数，初值确定的情况下实现了两个功能函数fun1和fun2轮流运行相同时间不断在彼此间切换的功能-There are two functions function fun1, fun2, finally calling the function M in xianxingqiehuan1 this document, the case of the initial implementation of th