接口 MessageEvent<T>

A message received by a target object.

interface MessageEvent<T> {
    AT_TARGET: number;
    bubbles: boolean;
    BUBBLING_PHASE: number;
    cancelable: boolean;
    cancelBubble: boolean;
    CAPTURING_PHASE: number;
    composed: boolean;
    currentTarget: null | EventTarget;
    data: T;
    defaultPrevented: boolean;
    eventPhase: number;
    isTrusted: boolean;
    lastEventId: string;
    NONE: number;
    origin: string;
    ports: readonly MessagePort[];
    returnValue: boolean;
    source: null | MessageEventSource;
    srcElement: null | EventTarget;
    target: null | EventTarget;
    timeStamp: number;
    type: string;
    composedPath(): EventTarget[];
    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
    initMessageEvent(type: string, bubbles?: boolean, cancelable?: boolean, data?: any, origin?: string, lastEventId?: string, source?: null | MessageEventSource, ports?: MessagePort[]): void;
    preventDefault(): void;
    stopImmediatePropagation(): void;
    stopPropagation(): void;
}

类型参数

  • T = any

层级 (查看完整内容)

属性

AT_TARGET bubbles BUBBLING_PHASE cancelable cancelBubble CAPTURING_PHASE composed currentTarget data defaultPrevented eventPhase isTrusted lastEventId NONE origin ports returnValue source srcElement target timeStamp type

方法

composedPath initEvent initMessageEvent preventDefault stopImmediatePropagation stopPropagation

属性

只读AT_TARGET

AT_TARGET: number

只读bubbles

bubbles: boolean

Returns true or false depending on how event was initialized. True if event goes through its target's ancestors in reverse tree order, and false otherwise.

只读BUBBLING_PHASE

BUBBLING_PHASE: number

只读cancelable

cancelable: boolean

Returns true or false depending on how event was initialized. Its return value does not always carry meaning, but true can indicate that part of the operation during which event was dispatched, can be canceled by invoking the preventDefault() method.

cancelBubble

cancelBubble: boolean

已被弃用

只读CAPTURING_PHASE

CAPTURING_PHASE: number

只读composed

composed: boolean

Returns true or false depending on how event was initialized. True if event invokes listeners past a ShadowRoot node that is the root of its target, and false otherwise.

只读currentTarget

currentTarget: null | EventTarget

Returns the object whose event listener's callback is currently being invoked.

只读data

data: T

Returns the data of the message.

只读defaultPrevented

defaultPrevented: boolean

Returns true if preventDefault() was invoked successfully to indicate cancelation, and false otherwise.

只读eventPhase

eventPhase: number

Returns the event's phase, which is one of NONE, CAPTURING_PHASE, AT_TARGET, and BUBBLING_PHASE.

只读isTrusted

isTrusted: boolean

Returns true if event was dispatched by the user agent, and false otherwise.

只读lastEventId

lastEventId: string

Returns the last event ID string, for server-sent events.

只读NONE

NONE: number

只读origin

origin: string

Returns the origin of the message, for server-sent events and cross-document messaging.

只读ports

ports: readonly MessagePort[]

Returns the MessagePort array sent with the message, for cross-document messaging and channel messaging.

returnValue

returnValue: boolean

已被弃用

只读source

source: null | MessageEventSource

Returns the WindowProxy of the source window, for cross-document messaging, and the MessagePort being attached, in the connect event fired at SharedWorkerGlobalScope objects.

只读srcElement

srcElement: null | EventTarget

已被弃用

只读target

target: null | EventTarget

Returns the object to which event is dispatched (its target).

只读timeStamp

timeStamp: number

Returns the event's timestamp as the number of milliseconds measured relative to the time origin.

只读type

type: string

Returns the type of event, e.g. "click", "hashchange", or "submit".

方法

composedPath

  • composedPath(): EventTarget[]

  • Returns the invocation target objects of event's path (objects on which listeners will be invoked), except for any nodes in shadow trees of which the shadow root's mode is "closed" that are not reachable from event's currentTarget.

    返回 EventTarget[]

initEvent

  • initEvent(type, bubbles?, cancelable?): void

  • 参数

    • type: string
    • 可选bubbles: boolean
    • 可选cancelable: boolean

    返回 void

    已被弃用

initMessageEvent

  • initMessageEvent(type, bubbles?, cancelable?, data?, origin?, lastEventId?, source?, ports?): void

  • 参数

    • type: string
    • 可选bubbles: boolean
    • 可选cancelable: boolean
    • 可选data: any
    • 可选origin: string
    • 可选lastEventId: string
    • 可选source: null | MessageEventSource
    • 可选ports: MessagePort[]

    返回 void

    已被弃用

preventDefault

  • preventDefault(): void

  • If invoked when the cancelable attribute value is true, and while executing a listener for the event with passive set to false, signals to the operation that caused event to be dispatched that it needs to be canceled.

    返回 void

stopImmediatePropagation

  • stopImmediatePropagation(): void

  • Invoking this method prevents event from reaching any registered event listeners after the current one finishes running and, when dispatched in a tree, also prevents event from reaching any other objects.

    返回 void

stopPropagation

  • stopPropagation(): void

  • When dispatched in a tree, invoking this method prevents event from reaching any objects other than the current object.

    返回 void

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