def search(request):
    searchtype = request.POST.get("searchtype")
    keyword = request.POST.get("keyword")
    if searchtype == "all":
        #多个字段模糊查询， 括号中的下划线是双下划线，双下划线前是字段名，双下划线后可以是icontains或contains,区别是是否大小写敏感，竖线是或的意思
        sciencenews = models.Sciencenews.objects.filter(Q(title__icontains=keyword)\
        |Q(content__icontains=keyword)|Q(author__icontains=keyword))
    elif searchtype == "author":
        #单个字段模糊查询
        sciencenews = models.Sciencenews.objects.filter(author__icontains=keyword)
    elif searchtype == "title":
        sciencenews = models.Sciencenews.objects.filter(title__icontains=keyword)
    elif searchtype == "content":
        sciencenews = models.Sciencenews.objects.filter(content__icontains=keyword)
    else:
        #使用点连接的filter链表示and
        sciencenews = models.Sciencenews.objects.filter(author__icontains=keyword).\
            filter(title__icontains=keyword).filter(content__icontains=keyword)

    return render(request,"show/index.html",{        "param":sciencenews,"searchtype":searchtype,"keyword":keyword})

 

　　#多个字段模糊查询， 括号中的下划线是双下划线，双下划线前是字段名，双下划线后可以是icontains或contains,区别是是否大小写敏感，竖线是或的意思sciencenews = models.Sciencenews.objects.filter(Q(title__icontains=keyword)|Q(content__icontains=keyword)|Q(author__icontains=keyword))