该属性返回或设置应用于字体或区域的下划线的类型。WdUnderline,可读写。
| WdUnderline 可以是下列 WdUnderline 常量之一: | 
| wdUnderlineDashHeavy | 
| wdUnderlineDashLongHeavy | 
| wdUnderlineDotDashHeavy | 
| wdUnderlineDotDotDashHeavy | 
| wdUnderlineDottedHeavy | 
| wdUnderlineNone | 
| wdUnderlineThick | 
| wdUnderlineWavyDouble | 
| wdUnderlineWords | 
| wdUnderlineDash | 
| wdUnderlineDashLong | 
| wdUnderlineDotDash | 
| wdUnderlineDotDotDash | 
| wdUnderlineDotted | 
| wdUnderlineDouble | 
| wdUnderlineSingle | 
| wdUnderlineWavy | 
| wdUnderlineWavyHeavy | 
expression.Underline
expression 必需。该表达式返回“应用于”列表中的一个对象。
本示例给活动文档中的第四个单词添加双下划线。
ActiveDocument.Words(4).Underline = wdUnderlineDouble
本示例给所选内容添加单下划线。
If Selection.Type = wdSelectionNormal Then
    Selection.Font.Underline = wdUnderlineSingle
Else
    MsgBox "You need to select some text."
End If