小编Fab*_*ice的帖子

即使代码运行完美，我也会遇到以下错误：

"TS2345: Argument of type 'Event' is not assignable to parameter of type 'KeyboardEvent'.
  Property 'altKey' is missing in type 'Event'." 

// In a Class

public listenTo = (window: Window) => {
  ['keydown', 'keyup'].forEach(eventName => {
     window.addEventListener(eventName, e => {
       this.handleEvent(e); // <- error here
     });
   });
}

public handleEvent = (event: KeyboardEvent) => {
    const { key } = event;
    //...
}

我试图将事件类型定义为KeyboardEvent，但是出现以下错误：

 window.addEventListener(eventName, (e:KeyboardEvent) => {
           this.handleEvent(e); // <- error here
         });


 TS2345: Argument of type '(event: KeyboardEvent) …

我有一个无状态功能组件,带有一个可选的函数参数作为属性(onClick),我试图将一个空函数定义为默认属性,以便能够在我的组件中安全地执行:

 <span onClick={props.onClick} />

但我有以下错误:"表达预期."

interface IProps {
  size?: sizeType;
  onClick?: (e:any) => void;
}
const Foo: React.SFC = (props: IProps) => {
  // ...
};
const defaultProps: IProps = {
   size: 'default',
   onClick: () => void <-- Expression expected.
};
Foo = defaultProps;

我怎么能这样做？