Python的Django框架中模板碎片缓存简介
你同样可以使用cache标签来缓存模板片段。 在模板的顶端附近加入{% load cache %}以通知模板存取缓存标签。
模板标签{% cache %}在给定的时间内缓存了块的内容。 它至少需要两个参数: 缓存超时时间（以秒计）和指定缓存片段的名称。 示例：
{% load cache %}
{% cache 500 sidebar %}
.. sidebar ..
{% endcache %}
有时你可能想缓存基于片段的动态内容的多份拷贝。 比如，你想为上一个例子的每个用户分别缓存侧边栏。 这样只需要给{% cache %}传递额外的参数以标识缓存片段。
{% load cache %}
{% cache 500 sidebar request.user.username %}
.. sidebar for logged in user ..
{% endcache %}
传递不止一个参数也是可行的。 简单地把参数传给{% cache %}。
缓存超时时间可以作为模板变量，只要它可以解析为整数值。 例如，如果模板变量my_timeout值为600，那么以下两个例子是等价的。
{% cache 600 sidebar %} ... {% endcache %}
{% cache my_timeout sidebar %} ... {% endcache %}这个特性在避免模板重复方面非常有用。 可以把超时时间保存在变量里，然后在别的地方复用。
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