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Django模板继承后出现logo图片无法加载的问题

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11/29
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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！！！

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。

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