减法不适用于速度模板 [英] subtraction is not working with velocity template
问题描述
我在速度 html 中有这个代码
I have this code in velocity html
<html>
#set ($Total1 = 0.0)
#set ($Total2 = 3.0)
#set ($Total3 = $Total2 -$Total1)
$Total3
</html>
$Total3 未显示.事实上，减法是行不通的.任何人都可以帮我解决这个问题
The $Total3 is not getting displayed. In fact the subtraction is not working. Can anyone please help me on this
推荐答案
我刚刚在 Velocity 1.6 中尝试了该示例，并且效果很好.
I just tried that example in Velocity 1.6 and it worked fine.
可能导致问题的两种可能情况.
Two possible things that might be causing problems.
(1) 您的示例没有正确复制.如果破折号位于标识符旁边，则它成为标识符的一部分.所以这个例子会失败，因为-"号实际上是 Total2 标识符的一部分.
(1) Your example is not copied correctly. If a dash is next to an identifier, it becomes part of the identifier. So this example would fail, since the "-" sign is actually part of the Total2 identifier.
#set ($Total3 = $Total2- $Total1)
(2) 您使用的是非常旧版本的 Velocity.浮点数是从 Velocity 1.5 开始的合法语法.(当前版本是 1.7).在此之前，整数是唯一允许的数字类型.
(2) You are using a very old version of Velocity. Floating point numbers were legal syntax beginning with Velocity 1.5. (The current version is 1.7). Before that point, integers were the only number type allowed.
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