这是一个多功能的函数式计算器，相对于简单的计算器，它的功能可是很强大的啊！希望大家会喜欢！-This is a multi-function calculator, compared to a simple calculator, but its function is very powerful ah! I hope you will like!

一个功能简单的计算器，可实现加，减，乘除，为调用api函数实现-A simple calculator function, addition, subtraction, multiplication and division, to call api function