在项目开发的过程中，遇到分页的第一页就展示大量的数据，导致前端列表加载展示的速度慢，所以需要在本地加入分页处理，把所有数据先放到内存里，下面我用Python演示如何实现本地分页的算法（针对二级数据结构）
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | initialSize = 2 # 首屏展示条数eachSize = 5 # 剩余页展示条数local_pages = [] # 本地分页数据def makePage(d): ''' 制作分页数据 ''' local_pages.clear() if calcSize(d) > initialSize: # 总条数大于首屏数，使用本地分页 sublist = [] for item in d: for child in item["child"]: sublist.append(child) firstPageSize = min(len(sublist), initialSize) # 第一页的大小 local_pages.append(sublist[0:firstPageSize]) # 取第一页的集合 remain_size = len(sublist)-firstPageSize # 剩余条数 group_count = int(remain_size / eachSize) # 计算分页数 last_count = remain_size % eachSize # 取余，最后剩余多少条 idx = 0 for idx in range(group_count): start = firstPageSize + idx * eachSize end = start + eachSize local_pages.append(sublist[start:end]) # 新增页集合 if last_count > 0: local_pages.append(sublist[-last_count:]) # 余数不为0，将作为最后一页集合 pass def calcSize(d)->int: ''' 计算总条数 ''' size = 0 for item in d: size += len(item["child"]) + 1 return sizedef printPage(): ''' 打印页面 ''' idx = 0 for p in local_pages: idx += 1 print("page:{}".format(idx)) for item in p: print(item)data = [{"id":"1", "name":"parent_1", "child":[ {"id":"1_1", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_2", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_3", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_4", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_5", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_6", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_7", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_8", "name":"RS234326348264", "parent_id":"1" }, {"id":"1_9", "name":"RS234326348264", "parent_id":"1" }]}, {"id":"2", "name":"parent_2", "child":[ {"id":"2_1", "name":"RS234326348264", "parent_id":"2" }]}]print(f"首屏展示条数:{initialSize}")print(f"剩余页展示条数:{eachSize}")makePage(data)printPage() |
打印结果
首屏展示条数:2
剩余页展示条数:5
page:1
{‘id’: ‘1_1’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘1_2’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
page:2
{‘id’: ‘1_3’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘1_4’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘1_5’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘1_6’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘1_7’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
page:3
{‘id’: ‘1_8’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘1_9’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘1’}
{‘id’: ‘2_1’, ‘name’: ‘RS234326348264’, ‘parent_id’: ‘2’}
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