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TS 这么写报错怎么办? Object is possibly 'null'

image.png

window.document.getElementsByTagName('iframe')[0].contentWindow.location.pathname
应该怎么写


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你要确定一定有个 iframe,不会是空,那就加非空断言。

document.getElementsByTagName('iframe')[0]!.contentWindow!.location.pathname

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