原因：在页面编辑的时候便于区分正文编辑区域与页眉页脚编辑区域。进入不同的编辑区域操作时当前操作的文字会变成深色而另外一个区域的文字会变浅，在页面打印时两者的显示颜色是一致的。
验证方法：
1、首先点击“插入”选项卡中的“页眉”选项。
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https://iknow-pic.cdn.bcebos.com/5ab5c9ea15ce36d37f51179e34f33a87e850b1c3"/>
2、进入页眉编辑页面后在其中输入页眉文字，可以看到此时页眉是深色文字而正文编辑处的文字是浅色的。
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https://iknow-pic.cdn.bcebos.com/9a504fc2d56285353dec468f9eef76c6a7ef6314"/>
3、双击正文编辑页面的空白处退出页眉编辑，即可看到此时页眉变成浅色显示而正文编辑变成深色显示。
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https://iknow-pic.cdn.bcebos.com/5fdf8db1cb134954f86b7cca584e9258d1094a23"/>
4、此时点击页面左上角的“打印预览”按钮。
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https://iknow-pic.cdn.bcebos.com/0bd162d9f2d3572c680709728413632763d0c3b3"/>
5、进入打印界面后即可看大此时显示的页眉和正文都是黑色深色字样。
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https://iknow-pic.cdn.bcebos.com/6d81800a19d8bc3e4e9493648c8ba61ea9d34584"/>
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