0.应用必须注册好
1.在当前的应用中创建一个templatetags的文件夹
2. The establishment of a python file for writing tag
3.导入django的template类,然后实例化一个register对象
from django import template
register = template.Library()
4. Custom Label
register.simple_tag @ # indicates that the function is custom label DEF get_bigcategory_list (): return BigCategory.objects.all () '' ' custom label parameter limit is not however correspond to the time used in HTML using {% Function name tag parameters%} '' '