As follows: Note, because in front of a function, according to use this function, so either in front of the statement, either on top before the function definition.

如下：注意，因为前面的函数据要用到此函数，所以要么在前面声明，要么放在上面函数之前定义。

youdao

As follows: Note, because in front of a function, according to use this function, so either in front of the statement, either on top before the function definition.

如下：注意，因为前面的函数据要用到此函数，所以要么在前面声明，要么放在上面函数之前定义。

youdao