performance function

• 功能函数

performance function的用法和样例：

例句

1. To help deal with the string, including the code conversion function.
   字符串处理帮助，包括编码转换等功能函数。
2. The maximum number of supported Modbus functions must be greater than the sum of all enabled functions in this file and custom function handlers.
   这个最大值要大于所有使能的功能函数和用户功能处理函数的总和。