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模板过滤器 - length_is


示例

检查列表中是否有 3 个项目

<h1>{{ fruits|length_is:3 }}</h1>
运行示例 »

定义和用法

如果对象的长度与指定数字相同,则 length_is 过滤器返回 True

这在处理 if 语句时非常有用

示例

如果 firstname 有 5 个字符,则写“Hello”

{% if firstname|length_is:5 %}
  <h1>Hello</h1>
{% endif %}
运行示例 »

语法

{{ value|length_is:len }}

模板过滤器通过使用管道 | 字符后跟过滤器的名称来定义。

参数通过使用冒号 : 字符后跟参数值来定义。


参数

描述
len 必需。一个数字,用于检查对象长度是否与之相同。

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