{% for book in books %}
      
                  
                  
    {% endfor %}
 
    
                

                

                  

                    

                      序號
                    
                    

                      id
                    
                    

                      書名
                    
                  
                
                

                    

                      {{ forloop.counter }}
                    
                    

                      {{ book.id }}
                    
                    

                      {{ book.title }}
                    
                  
              
              
            
          

            
from django.shortcuts import render
from app01 import models 
def book_list(request):
  # 從 URL 中取參數
  page_num = request.GET.get("page")
  print(page_num, type(page_num))
  page_num = int(page_num)
 
  # 定義兩個變量保存數據從哪兒取到哪兒
  data_start = (page_num-1)*10
  data_end = page_num*10
 
  # 書籍總數
  total_count = models.Book.objects.all().count()
 
  # 每一頁顯示多少條數據
  per_page = 10
 
  # 總共需要多少頁碼來顯示
  total_page, m = divmod(total_count, per_page)
 
  # 頁面上最多展示的頁碼
  max_page = 11
  half_max_page = max_page // 2
 
  # 頁面上展示的頁碼的開始頁
  page_start = page_num - half_max_page
  # 頁面上展示的頁碼的結束頁
  page_end = page_num + half_max_page
 
  # 如果當前頁減一半比 1 小
  if page_start <= 1:
    page_start = 1
    page_end = max_page
  # 如果當前頁加一半比總頁碼還大
  if page_end > total_page:
    page_end = total_page
    page_start = total_page - max_page + 1
 
  # 如果還有數據
  if m:
    total_page += 1
 
  all_book = models.Book.objects.all()[data_start:data_end]
 
  # 拼接 html 的分頁代碼
  html_list = []
  for i in range(page_start, page_end+1):
    tmp = '
            

              
                {0}
              
            
            '.format(i)
    html_list.append(tmp)
 
  page_html = "".join(html_list)
 
  return render(request, "book_list.html", {"books": all_book, "page_html": page_html})