python include标签的使用方式及说明

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2023-04-07
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目录
  • include标签如何使用？
  • include标签的使用
  • 截图如下
  • 总结

include标签如何使用？

include标签的使用

在讲python include标签使用之前，我们新建一个include_demo项目

截图如下

项目新建好了，再在templates文件下新建一个index.html文件，代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{margin:0;padding:0;}
        ul{list-style: none;}
        a{text-decoration: none;
            color: #ffffff;}
        nav,footer,.main{width:1000px; height:40px; margin:0 auto;}
        ul{width: 1000px; height:40px; line-height: 40px;
            background-color:#000000;}
        li{width:120px; height:40px; line-height:40px; text-align: center;
        float:left;}
        .main{clear:both; line-height:40px; background-color:pink;}
        footer{height:40px;  background-color: green;}
    </style>
</head>
<body>
 
        <nav>
            <ul>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >首页</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >关于我们</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >产品中心</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >新闻中心</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >服务宗旨</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >联系我们</a></li>
            </ul>
        </nav>
        <div class="main">
            网站首页主体部分
        </div>
       <footer>
            网站首页footer部分
       </footer>
 
</body>
</html>

然后在include_demo.py页面渲染一下index模板文件，代码如下：

from flask import Flask,render_template
 
app = Flask(__name__)
 
@app.route('/')
def hello_world():
    return render_template("index.html")
 
 
if __name__ == '__main__':
    app.run(debug=True)

运行include_demo.py文件，运行结果如下：

在这里主要是为了方便讲解include标签，所有没太注重前端页面部分。

通过上面index.html文件就能发现，我将公共和私有代码部分都在一块，假设网站有几十个页面，我将所有公共代码和私有代码

都放一块，如果有一天要修改某个公共代码块，哪就得修改几十个页面，那将是件非常麻烦的事。为了方便管理项目，我们将页面公共、私有代码部分抽取出来。

我们新建一个header.html文件，把css样式及nav标签内容复制到header.html页面中。

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{margin:0;padding:0;}
        ul{list-style: none;}
        a{text-decoration: none;
            color: #ffffff;}
        nav,footer,.main{width:1000px; height:40px; margin:0 auto;}
        ul{width: 1000px; height:40px; line-height: 40px;
            background-color:#000000;}
        li{width:120px; height:40px; line-height:40px; text-align: center;
        float:left;}
        .main{clear:both; line-height:40px; background-color:pink;}
        footer{height:40px;  background-color: green;}
    </style>
</head>
<body>
      <nav>
            <ul>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >首页</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >关于我们</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >产品中心</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >新闻中心</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >服务宗旨</a></li>
                <li><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >联系我们</a></li>
            </ul>
        </nav>
</body>
</html>

然后新建一个footer.html文件，把footer标签中的内容复制到该文件中。

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
     <footer>
            网站首页footer部分
     </footer>
     </footer>
</body>
</html>

我们在运行主app文件，结果如下：

(＾－＾)，为啥没有居中，背景色也不见了？？因为我们没有把样式引入进来（嗯，页面太丑了，没法看了，赶紧关了！！）

OK！我们将公共代码抽取出来后。记得在index.html文件中用include标签导入header、footer代码块，代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
   {% include "header.html" %}
        <div class="main">
            网站首页主体部分
        </div>
    {% include "footer.html" %}
</body>
</html>

再运行主app文件，结果如下：

嗯，结果是不是和之前一样，对吧！

通过上面例子，相信大部分小伙伴都明白了include标签的作用及用法。总之一句话，include标签的作用就相当于把抽取的代码复制到当前页面中。

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