如何计算html/template中的内容

问题描述

您如何计算go的html模板中的内容?

How can you calculate something inside a html template of go?

例如:

{{ $length := len . }}
<p>The last index of this map is: {{ $length -1 }} </p>

是.是地图.
代码 {{$ length -1}} 无法正常工作，有没有办法实现?

Were the . is a map.
The code {{ $length -1 }} is not working, is there a way to achieve this?

推荐答案

您不能.模板不是脚本语言.按照设计哲学，复杂的逻辑应该在模板之外.

You can't. Templates are not a scripting language. By design philosophy, complex logic should be outside of templates.

要么将计算结果作为参数传递(首选/最简单)，要么注册可在模板执行期间调用的自定义函数，将值传递给它们，并可以执行计算并返回任何值(例如，返回 param-1 ).

Either pass the calculated result as a parameter (preferred / easiest), or register custom functions which you can call during template execution, pass values to them and which may perform calculations and return any values (e.g. return param - 1).

有关注册和使用自定义功能的示例，请参见:

For examples of registering and using custom functions, see:

Golang模板(并将函子传递到模板)

如何访问对象模板中按变量字段?

迭代Go地图获取索引.

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