函数作为interface参数定义

无参数无返回

Example 1:

Function that does not take arguments and does not return a value:

interface MyClassProps {
    someProp: string;
    onChange(): any;
}
class MyClass extends React.Component<MyClassProps, MyClassState> ...

有参数有返回

Example 2:

Function that accepts an argument and returns a value:

interface MyClassProps {
    onChange(name: string): number;
}

函数可选

Example 3:

Function that is optional:

interface MyClassProps {
    onChange?(name: string): number;
    niceProp: boolean;
}

使用类型

Example 4:

Using the type keyword:

type MyFunctionType = (name: string) => number;
interface MyClassProps {
    onChange: MyFunctionType;
    niceProp: string;
}