父文件：index.html
<!DOCTYPE html>
<html lang="en">
<head><title>{% block title %}Index{% endblock %}</title><meta charset="utf-8"><script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="../static/css/index.css"><script src="static/js/index.js"></script><link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css"><script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script><script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script><script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
<!--导航栏--><a class="navbar-brand" href="/">{% block ico %}<img src="/static/images/ppl.jpg" alt="logo" style="width:50px;"> {% endblock %}</a><!--<h2>胶囊</h2>--><!--<p>胶囊导航:</p>--><ul class="nav nav-pills"><li class="nav-item"><a class="nav-link" href="/">首页</a></li><li class="nav-item"><a class="nav-link" href="/insert/" id="insert">insertPerson</a></li><li class="nav-item"><a class="nav-link" href="/get1/">addAccount</a></li><li class="nav-item"><a class="nav-link" href="/search1/">SearchPerson</a></li><li class="nav-item"><a class="nav-link disabled" href="#">SearchPerson</a></li><li class="nav-item dropdown"><a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">注册/登录</a><div class="dropdown-menu"><a class="dropdown-item" href="#">注册</a><a class="dropdown-item" href="#">登录</a><a class="dropdown-item" href="#">登出</a></div></li></ul></nav>
{% block index %}
<br>
<div id="demo" class="carousel slide" data-ride="carousel"><!-- 指示符 --><ul class="carousel-indicators"><li data-target="#demo" data-slide-to="0" class="active"></li><li data-target="#demo" data-slide-to="1"></li><li data-target="#demo" data-slide-to="2"></li></ul><!-- 轮播图片 --><div class="carousel-inner" ><div class="carousel-item active"><img src="http://static.runoob.com/images/mix/img_fjords_wide.jpg" style="width:100%"></div><div class="carousel-item"><img src="http://static.runoob.com/images/mix/img_nature_wide.jpg" style="width:100%"></div><div class="carousel-item"><img src="http://static.runoob.com/images/mix/img_mountains_wide.jpg" style="width:100%"></div></div><!-- 左右切换按钮 --><a class="carousel-control-prev" href="#demo" data-slide="prev"><span class="carousel-control-prev-icon"></span></a><a class="carousel-control-next" href="#demo" data-slide="next"><span class="carousel-control-next-icon"></span></a></div>
<div class="foot-box"></div>
{% endblock %}<!--实现鼠标滑过导航栏增加active类属性-->
<script>$(document).ready(function(){$('.nav-link').hover(function(){$(this).addClass('active');},function(){$(this).removeClass('active');});});
</script>
</body>
</html>
子文件-继承自index.html
{% extends "index.html" %}
{% block title %}Insert{% endblock %}{% block index %}<!--<form action="/do/" method="post">--><!--姓名：<input type="text" name="username"><br>--><!--年龄：<input type="text" name="userage"><br>--><!--<input type="reset">--><!--<button type="submit">提交</button>-->
<!--</form>--><div class="container"><br><a href="#demo" class="btn btn-primary" data-toggle="collapse">插入新人信息</a><div id="demo" class="collapse"><form action="/do/" method="post"><div class="form-group"><label for="user">Username:</label><input type="text" class="form-control" id="user" name="username" placeholder="Enter Username"></div><div class="form-group"><label for="age">Userage:</label><input type="password" class="form-control" id="age" name="userage" placeholder="Enter Userage"></div><div class="form-check"><label class="form-check-label"><input class="form-check-input" type="checkbox"> Remember me</label></div><button type="submit" class="btn btn-primary">Submit</button></form></div>
</div>{% endblock %} 注意！！！
javascript undefined。在index.html文件中的
{% block ico %}<img src="/static/images/ppl.jpg" alt="logo" style="width:50px;"> {% endblock %}
中
src="/static/images/ppl.jpg" 和 src="static/images/ppl.jpg" 完全不一样的效果，前者被继承后子页面的logo可正常显示，后者则会出现图片无法加载的问题。
因为在settings中我们已经设置了静态文件收集路径，在base模板中索引静态文件的时候需要从static根路径下进行索引，故需要加"/"，此坑难发现，还需多学习。
django form。
