iframe 子页面postMessage报错 Failed to execute ‘postMessage‘ on ‘DOMWindow‘

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报错信息：

Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('http://a.page.com') does not match the recipient window's origin ('http://b.page.com')

解决方式：在子页面使用postMessage时指定origin

例如：

const host = 'http://b.page.com'
window.parent.postMessage({data: 'test'}, host);

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