Velocity ——VTL模板中的注釋

注釋允許在模板中包含描述文字，而這些文字不會被放置到模板引擎的輸出中。注釋是一種有效的提醒自己和向別人解釋你的VTL語句要做什么事情的方法。你也可以把注釋用來做其他你認為有用的用途。下面就是一個注釋的例子。

## This is a single line comment.

一個單行的注釋以##開始，直到行尾才結束。如果你要寫很多行的注釋，那么不用使用多各單行注釋，VTL還提供了多行注釋。多行注釋以#*開始，以*#結束。下面是一個多行注釋的例子。

This is text that is outside the multi-line comment.

Online visitors can see it.

#*

Thus begins a multi-line comment. Online visitors won't

see this text because the Velocity Templating Engine will

ignore it.

*#

Here is text outside the multi-line comment; it is visible.

在使用Velocity引擎解析上面的模板時，輸出的結果是：

This is text that is outside the multi-line comment.

Online visitors can see it.

Here is text outside the multi-line comment; it is visible.

可以看到，多行注釋內的內容是不會輸出的。

下面的例子闡明了注釋的用法：

This text is visible. ## This text is not.

This text is visible.

This text is visible. #* This text, as part of a multi-line comment,

is not visible. This text is not visible; it is also part of the

multi-line comment. This text still not visible. *# This text is outside

the comment, so it is visible.

## This text is not visible.

用Velocity引擎解析上面的模板，輸出的結果是：

This text is visible. This text is visible.

This text is visible. This text is outside

the comment, so it is visible.

在VTL中還有第三種注釋：VTL注釋塊。VTL注釋塊用來保存如文檔的作者、版本號等信息。例如：

#**

This is a VTL comment block and

may be used to store such information

as the document author and versioning

information:

@author

@version 5

*#

總結

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