django和tornado的一些区别

tornado和django的区别

从模板上来说

前端模板上的使用的语法有些区别

tornado可以通过render传类及函数

class Calculation:
    def sum(self,a,b):
        return a+b
class UiHandler(tornado.web.RequestHandler):
    def func(self):
        return 'arrow'
    def get(self):
        name = self.get_argument('name', 'no')
        self.render(
            'index.html',
            name = name,
            func=self.func,
            cal=Calculation,
        )

tornado可以通过ui_methods,ui_modules传函数和类

handlers = [ui_methods=util.uimethod,
            ui_modules=util.uimodules,
            ]

ui_methods中的函数要传self参数

def methods1(self):
    return 'ui_methods1'

ui_modules要继承UIModule类

from tornado.web import UIModule
class Advertisdement(UIModule):
    def render(self, *args, **kwargs):
        return self.render_string('07ad.html')  #render传html文件 
    def css_files(self):
        return "/static/css/King_Chance_Layer7.css"  #css_files传css文件
    def javascript_files(self):   #javascript_files传js文件   
        return [
            "/static/js/jquery_1_7.js",
            "/static/js/King_Chance_Layer.js",
            "/static/js/King_layer_test.js",
        ]

django可以通过上下文渲染器来传

创建上下文渲染器文件context_processors.py

from .models import GoodsCategory

def category_list(request):
    category_list = GoodsCategory.objects.filter(status=0).all()
    return {"category_list": category_list}

添加到settings的TEMPLATES中

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
                'django.template.context_processors.static',
                'shop.context_processors.category_list',
            ],  
        },
    },
]

在前端页面使用

<div class="breadcrumb">
        <a href="{% url 'shop:index' %}">全部分类</a>
        <span>></span>
        <a href="#">{{ goods_category.name }}</a>
    </div>
​
    <div class="main_wrap clearfix">
        <div class="l_wrap fl clearfix">
            <div class="new_goods">
                <h3>新品推荐</h3>
                {% refferral_goods cid %}
            </div>
        </div>

django可以通过自定义标签来传

在app下创建templatetags包在该目录下创建tags.py

@register.simple_tag
def divide_page(curr_page, page_obj, url_name, request_url, page_name="", args=(), kwargs={}):
    """
        算法
            1、先获取所有页码列表
            range_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]

            2、 然后定义需要展示的数目，这里定义为一个5
            max_page_count = 5

            3、获取中间位置前后需要加减索引
            center_index = max_page_count / 2

            4、获取当前页面索引，这里定义为当前页面为5
            curr_index = range_list.index(5)
            range_list[curr_index-center_index:]
            [3, 4, 5, 6, 7, 8, 9]

            5、循环处理右边
            获取一个计数器
            当计数器的索引大于总数目时退出
            [3, 4, 5, 6, 7, 8, 9] 迭代这个时
            当迭代到7的位置，计数器的值就为6，退出循环，就获取到以下列表
            [3, 4, 5, 6, 7]

    """
    def parse_qs(qs):
        res = {}
        params = qs.split("&")
        for p_str in params:
            k, v = p_str.split("=")
            res[k] = urllib.unquote(v)
        return res

    url = reverse(url_name, args=args, kwargs=kwargs)       # 点击页码需要跳转的url前缀
    # 默认为unicode,这里修改为utf8
    url = url.encode("utf8")
    page_str = '<div class="pagenation">'
    max_page_count = 5
    page = page_obj.page(curr_page)

    # 获取当前get参数
    params = parse_qs(urlparse.urlparse(request_url).query.encode("utf8"))

    if not page_name:
        page_name = "curr_page"

    # 生成上一页html
    if page.has_previous():
        params[page_name] = curr_page - 1

        curr_url = "%s?%s" % (url, urllib.urlencode(params))
        page_str += '<a href="%s" style=" 上一页 </a>' % curr_url

    center_index = max_page_count / 2
    page_range = [c for c in page_obj.page_range]
    page_index = page_range.index(curr_page)

    if page_index >= center_index:
        page_range = page_range[page_index-center_index:]

    i = 1
    # 生成中间页码html
    for cp in page_range:
        params[page_name] = cp
        # curr_url = "%s?%s" % (url, "&".join(["%s=%s" % (k,v) for k,v in params.items()]))
        curr_url = "%s?%s" % (url, urllib.urlencode(params))
        if cp == curr_page:
            page_str += '<a href="%s" class="active" style="%s</a>' % (
                curr_url, cp)
        else:
            page_str += '<a href="%s" >%s</a>' % (
                curr_url, cp)

        i += 1
        if i > max_page_count:
            break

    # 生成下一页html
    if page.has_next():
        params[page_name] = curr_page + 1
        curr_url = "%s?%s" % (url, urllib.urlencode(params))
        page_str += '<a href="%s" style=" 下一页 </a>' % curr_url

    page_str += "</div>"

    return mark_safe(page_str)

在前端模板中调用

{% extends 'shop_base.html' %}
{% load tags %}
​
{% block shop_js %}
    <script type="text/javascript" src="{{ STATIC_URL }}js/list.js"></script>
{% endblock shop_js %}
​
{% block index_content %} 
{{ block.super }}
​
<div>
    {% divide_page curr_page p 'shop:categorys' request.get_full_path kwargs=params %}
</div>