When changing your page background color, it will only be applied to that specific document and is not a global or default change.
You may want to change the page background color to No Color when saving a document that is shared with other individuals or when sharing the document electronically.
For those using version 2106 of Word 365 (not sure about Word 2016 or 2019)
If you go to File -> Options -> General, there is an option on the "Personalize your copy of Microsoft Office" section and select Black theme, the page background is black. There is a "Disable dark mode" setting next to the theme. When it is not selected, the page has a black background while using the Black theme.
更新答案：
只需转到“查看”并选择
老答案：
{资源}
在“设计”下，选择“页面颜色”：
当您将鼠标悬停在“主题颜色”下的选项上时，您的文档将预览颜色。
例如：
至于打印深色背景的风险——正如评论中所建议的——这在 Office Word 2016 中不会发生，因为特定选项（文件 > 更多... > 选项 > 显示 > 打印背景颜色和图像）被禁用默认情况下。
我可以为 Office Word 2016 确认这一点，但不能保证旧版本。因此，在这种情况下，应检查上述选项是否已禁用，甚至进行一些测试 - 并在此处发布以供所有人了解。
有关这方面的更多选项，请参阅这篇文章，其中说这也适用于 Office 2013 和 2011。
它还指出：
不会打印页面背景颜色，但会保存为文档的一部分。
When changing your page background color, it will only be applied to that specific document and is not a global or default change.
You may want to change the page background color to No Color when saving a document that is shared with other individuals or when sharing the document electronically.
For those using version 2106 of Word 365 (not sure about Word 2016 or 2019)
If you go to File -> Options -> General, there is an option on the "Personalize your copy of Microsoft Office" section and select Black theme, the page background is black. There is a "Disable dark mode" setting next to the theme. When it is not selected, the page has a black background while using the Black theme.
它非常简单：转到设计并单击以将背景更改为黑色。查看屏幕截图：在此处输入图像描述