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This will return null only when focus has been set to "no component."
这样，只有当焦点被设置成“无组件（no component）”时才会返回空。
youdao
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No component or content is directly rendered in the page design.
组件和内容都不是直接呈现在页面设计中。
youdao
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No component or content is directly rendered in the page design.
组件和内容都不是直接呈现在页面设计中。
youdao