typeEventHandler<EextendsSyntheticEvent<any>>={ bivarianceHack(event:E): void }["bivarianceHack"]; typeReactEventHandler<T=Element>=EventHandler<SyntheticEvent<T>>; typeClipboardEventHandler<T=Element>=EventHandler<ClipboardEvent<T>>; typeDragEventHandler<T=Element>=EventHandler<DragEvent<T>>; ...
lib.dom.ts中有一个类型，它包含所有事件名称和事件参数类型之间的映射。它被称为WindowEventMap。
functionhandler(event:Event) { constelement=eventasHTMLElement; // Error: 'Event' 和 'HTMLElement' 中的任何一个都不能赋值给另外一个 } 如果你仍然想使用那个类型,你可以使用双重断言。首先断言成兼容所有类型的any functionhandler(event:Event) { constelement= (eventasany)asHTMLElement; // 正常 } ...
(坑爹的Index signature for type 'string' is missing报错) 然后是 eventMap,它的实际内容是这样的: eventMap = { event1: [ handler1, handler2 ], event2: [ handler3, handler4 ] } AI代码助手复制代码 所以key 需要为传入对象类型参数的 key。 函数则不用指定特定类型,因为它是私有的,无法被类外部...
interface MouseEvent extends Event { eventX: number; eventY: number; } interface KeyEvent extends Event { keyCode: number; } function listenEvent(eventType: EventType, handler: (n:Event) => void) { // other } listenEvent(EventType.Mouse, (e: MouseEvent)=>console.log(e.eventX+', '...
// Still disallowed (clear error). Type safety enforced for wholly incompatible types listenEvent(EventType.Mouse, (e: number) => console.log(e)); 我们可以看到 (MouseEvent)=>void赋值给(Event)=>void失败了 因为子类型想变化成父类型
value 本来的类型应该是 (...args: any[]) => void,好限制为函数。但在不是非字面量类型直传的情况下无法通过类型检测,只好改成 any 了。(坑爹的 Index signature for type 'string' is missing 报错)。 然后是 eventMap,它的实际内容是这样的: ...
interface MouseEvent extends Event{x:number;y:number} interface KeyEvent extends Event {keyCode:number} function listenEvent(eventType: EventType,handler:(n: Event)=> void){ /* ... */ } //使用精确类型 listenEvent(EventType.Mouse,(e:MouseEvent) => console.log(e.x+','+e.y)); ...
}//默认值export function eventHandler =( evt: CloseEvent| MessageEvent |Event, socket: Socket, type= 'WebSocket'//默认值) => any; 独立函数怎么声明类型 刚开始我也很纠结这个问题,我就是一个独立的函数,怎么声明类型呢?尤其是写事件处理函数的API时。
I am trying to pass an Event Handler to onInput and onBlur but it is complaining about my types for the function itself. The code works, but I cannot find the correct type. My event handler is: public onInput = ({target}: {target: HTMLIn...