python include标签如何使用
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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：
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