Django：显示在每个页面上加载页面所花费的时间

您可以创建自定义middleware来记录此情况.下面是我如何基于http://djangosnippets.org/snippets/358/创建一个中间件来实现此目的(我稍微修改了代码).

首先，假设您的项目名为:test_project，创建一个文件名middlewares.py，我将其放在与settings.py相同的文件夹中:

from django.db import connection
from time import time
from operator import add
import re


class StatsMiddleware(object):

    def process_view(self, request, view_func, view_args, view_kwargs):
        '''
        In your base template, put this:
        <div id="stats">
        <!-- STATS: Total: %(total_time).2fs Python: %(python_time).2fs DB: %(db_time).2fs Queries: %(db_queries)d ENDSTATS -->
        </div>
        '''

        # Uncomment the following if you want to get stats on DEBUG=True only
        #if not settings.DEBUG:
        #    return None

        # get number of db queries before we do anything
        n = len(connection.queries)

        # time the view
        start = time()
        response = view_func(request, *view_args, **view_kwargs)
        total_time = time() - start

        # compute the db time for the queries just run
        db_queries = len(connection.queries) - n
        if db_queries:
            db_time = reduce(add, [float(q['time'])
                                   for q in connection.queries[n:]])
        else:
            db_time = 0.0

        # and backout python time
        python_time = total_time - db_time

        stats = {
            'total_time': total_time,
            'python_time': python_time,
            'db_time': db_time,
            'db_queries': db_queries,
        }

        # replace the comment if found
        if response and response.content:
            s = response.content
            regexp = re.compile(r'(?P<cmt><!--\s*STATS:(?P<fmt>.*?)ENDSTATS\s*-->)')
            match = regexp.search(s)
            if match:
                s = (s[:match.start('cmt')] +
                     match.group('fmt') % stats +
                     s[match.end('cmt'):])
                response.content = s

        return response

其次，修改settings.py以添加您的中间件:

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    # ... your existing middlewares ...

    # your custom middleware here
    'test_project.middlewares.StatsMiddleware',
)

注意:您必须像上面那样向中间件类添加完整路径，格式如下:

<project_name>.<middleware_file_name>.<middleware_class_name>

第二个注意事项是，我将这个中间件添加到列表的末尾，因为我只想单独记录模板加载时间.如果您想记录模板+所有中间件的加载时间，请将其放在MIDDLEWARE_CLASSES列表的开头(计入@Symmitchry).

回到主要主题，下一步是修改您想要记录加载时间的base.html个或任何页面，添加以下内容:

<div id="stats">
<!-- STATS: Total: %(total_time).2fs Python: %(python_time).2fs DB: %(db_time).2fs Queries: %(db_queries)d ENDSTATS -->
</div>

注意:您可以随心所欲地命名<div id="stats">并对该div使用CSS，但不要更改注释<!-- STATS: .... -->.如果您想要更改它，请确保根据创建的middlewares.py中的正则表达式模式对其进行测试.

瞧，好好享受统计数据吧.

EDIT:个

对于那些经常使用CBV(基于类的视图)的人来说，上述解决方案可能会遇到错误ContentNotRenderedError.别担心，下面是middlewares.py中的解决方案:

    # replace the comment if found
    if response:
        try:
            # detects TemplateResponse which are not yet rendered
            if response.is_rendered:
                rendered_content = response.content
            else:
                rendered_content = response.rendered_content
        except AttributeError:  # django < 1.5
            rendered_content = response.content
        if rendered_content:
            s = rendered_content
            regexp = re.compile(
                r'(?P<cmt><!--\s*STATS:(?P<fmt>.*?)ENDSTATS\s*-->)'
            )
            match = regexp.search(s)
            if match:
                s = (s[:match.start('cmt')] +
                     match.group('fmt') % stats +
                     s[match.end('cmt'):])
                response.content = s

    return response

我用Django 1.6实现了.x、 如果你对Django的其他版本有问题，请在 comments 区给我打电话.