代码来自这里：
base.html
<html> <head>...</head> <body> ... {% block nav %} <ul id="nav"> <li>{% block nav-home %}<a href="{% url home %}">Home</a>{% endblock %}</li> <li>{% block nav-about %}<a href="{% url about %}">About</a>{% endblock %}</li> <li>{% block nav-contact %}<a href="{% url contact %}">Contact</a>{% endblock %}</li> </ul> {% endblock %} ... </body> </html>
about.html
{% extends "base.html" %} {% block nav-about %}<strong class="nav-active">About</strong>{% endblock %}
PS: vim多行缩进的方法是选中对应行，按"<"以及">"，按"=="可将选中的行进行自动缩进。