A function contains some code that will be executed only by an event or by a call to that function.

函数内的一些代码只有在某个事件触发或被调用的时候才会被执行。

youdao

A function contains some code that will be executed only by an event or by a call to that function.

函数内的一些代码只有在某个事件触发或被调用的时候才会被执行。

youdao