Javascript 如何获得<；iframe>；使用postMessage（）的

我有一个页面，上面有大约5个iFrame。有时在加载时，iframe会出错。我拥有它，因此错误页面将

postMessage（'reload'，*）

返回到父站点，但这并不能告诉我哪个iframe触发了

postMessage（）

子站点，index.blade.php

@extends('layouts.application')

@section('content')
    <noscript><h4>Portlet failed to load. Please try refreshing this page.</h4></noscript>
@stop

@push('scripts')
    <script>
        jQuery(function($) {
            window.parent.postMessage("reload", "*");
        });
    </script>
@endpush

MessageEvent

{
bubbles: false
cancelBubble: false
cancelable: false
composed: false
currentTarget: Window {parent: Window, opener: null, top: Window, length: 1, frames: Window, …}
data: "reload"
defaultPrevented: false
eventPhase: 0
isTrusted: true
lastEventId: ""
origin: "https://childsite.domain.com"
path: [Window]
ports: []
returnValue: true
source: Window {window: Window, self: Window, location: Location, closed: false, frames: Window, …}
srcElement: Window {parent: Window, opener: null, top: Window, length: 1, frames: Window, …}
target: Window {parent: Window, opener: null, top: Window, length: 1, frames: Window, …}
timeStamp: 3550.64499983564
type: "message"
userActivation: null
__proto__: MessageEvent
}

有没有办法获取生成消息的

，以便我只能重新加载该消息

{
bubbles: false
cancelBubble: false
cancelable: false
composed: false
currentTarget: Window {parent: Window, opener: null, top: Window, length: 1, frames: Window, …}
data: "reload"
defaultPrevented: false
eventPhase: 0
isTrusted: true
lastEventId: ""
origin: "https://childsite.domain.com"
path: [Window]
ports: []
returnValue: true
source: Window {window: Window, self: Window, location: Location, closed: false, frames: Window, …}
srcElement: Window {parent: Window, opener: null, top: Window, length: 1, frames: Window, …}
target: Window {parent: Window, opener: null, top: Window, length: 1, frames: Window, …}
timeStamp: 3550.64499983564
type: "message"
userActivation: null
__proto__: MessageEvent
}