在Java Xstream中如何更改对象内的别名？(in Java Xstream how to change alias inside an object?)

 您确实希望使用CSS类为元素的该部分赋予意义并为其设置样式。 使用给定的类将其包装在<span> ，然后通过样式表应用样式。 
 
document.getElementById(i).innerHTML = weekday + " " 
                                       + date
                                       + " <span class='month'>" + month + "</span> "
                                       + year;
 
 样式 
 
.month { text-decoration: underline; }
 
 使用语义类而不是特定标记或内联样式，您可以在全局范围内轻松更改此类显示的样式，而不必更新样式发生的每个单独位置。 
 
 编辑：显然你最了解你的应用程序，但我会避免下划线除了链接或惯例规定（如某些标题）应该使用它。 对于用户来说这可能非常混乱，因为在浏览器中的下划线通常表示某些东西是可点击的链接。 这似乎不是你想要的，但我可能是错的。 

You do want to use a CSS class to give meaning to that portion of the element and style it. Wrap it in a <span> with the given class and then apply the styles through your style sheet.
 
document.getElementById(i).innerHTML = weekday + " " 
                                       + date
                                       + " <span class='month'>" + month + "</span> "
                                       + year;
 
Style
 
.month { text-decoration: underline; }
 
Using a semantic class, rather than a specific tag or inline styles, allows you to easily change the style of this type of display on a global basis rather than having to update each individual place where the styling occurs.
 
EDIT: Obviously you know your application best, but I would avoid underlining except for links or where convention dictates (like some titles) that it should be used. It can be very confusing for a user since underlining in a browser typically conveys that something is a clickable link. That doesn't seem to be what you're going for here, but I could be wrong.