当不知道函数形式和样式的时候，可以用随机拟合的方法，但是效率不高。这里用遗传算法替代穷举法。其中遗传算法这个函数极好用，大家可以收藏，我这里也可以看做是这个遗传算法的应用。(When you do not know the form and style of function, you can use the random fitting method, but the efficiency is not high. Here, genetic algorithm is used instead of exhaustion. Among them, the genetic algorithm this function is very good, we can collect, I can also see here is the application of this genetic algorithm.)