json模拟数据实现分页效果

首先，我们需要生成一个包含多条数据的 JSON 数据，例如：

{
  "data": [
    {"id": 1, "name": "Alice", "age": 20},
    {"id": 2, "name": "Bob", "age": 22},
    {"id": 3, "name": "Charlie", "age": 25},
    {"id": 4, "name": "David", "age": 30},
    {"id": 5, "name": "Emily", "age": 28},
    {"id": 6, "name": "Frank", "age": 35},
    {"id": 7, "name": "Grace", "age": 18},
    {"id": 8, "name": "Henry", "age": 27},
    {"id": 9, "name": "Ivy", "age": 23},
    {"id": 10, "name": "Jack", "age": 32},
    {"id": 11, "name": "Kate", "age": 29},
    {"id": 12, "name": "Leo", "age": 26},
    {"id": 13, "name": "Maggie", "age": 21},
    {"id": 14, "name": "Nancy", "age": 24},
    {"id": 15, "name": "Oliver", "age": 33},
    {"id": 16, "name": "Penny", "age": 31},
    {"id": 17, "name": "Quinn", "age": 19},
    {"id": 18, "name": "Ray", "age": 36},
    {"id": 19, "name": "Sandy", "age": 37},
    {"id": 20, "name": "Tom", "age": 34}
  ]
}

接着，我们可以使用 JavaScript 编写一个函数来实现分页效果：

function paginate(data, page, pageSize) {
  const start = (page - 1) * pageSize;
  const end = start + pageSize;
  const paginatedData = data.slice(start, end);
  return paginatedData;
}

其中，`data` 表示要分页的 JSON 数据，`page` 表示当前页数，`pageSize` 表示每页显示的数据量。函数会根据当前页数和每页显示的数据量来计算出应该显示哪些数据，并返回分页后的数据。

例如，我们可以使用以下代码来测试分页效果：

const jsonData = {
  "data": [
    {"id": 1, "name": "Alice", "age": 20},
    {"id": 2, "name": "Bob", "age": 22},
    {"id": 3, "name": "Charlie", "age": 25},
    {"id": 4, "name": "David", "age": 30},
    {"id": 5, "name": "Emily", "age": 28},
    {"id": 6, "name": "Frank", "age": 35},
    {"id": 7, "name": "Grace", "age": 18},
    {"id": 8, "name": "Henry", "age": 27},
    {"id": 9, "name": "Ivy", "age": 23},
    {"id": 10, "name": "Jack", "age": 32},
    {"id": 11, "name": "Kate", "age": 29},
    {"id": 12, "name": "Leo", "age": 26},
    {"id": 13, "name": "Maggie", "age": 21},
    {"id": 14, "name": "Nancy", "age": 24},
    {"id": 15, "name": "Oliver", "age": 33},
    {"id": 16, "name": "Penny", "age": 31},
    {"id": 17, "name": "Quinn", "age": 19},
    {"id": 18, "name": "Ray", "age": 36},
    {"id": 19, "name": "Sandy", "age": 37},
    {"id": 20, "name": "Tom", "age": 34}
  ]
};

const page = 2;
const pageSize = 5;

const paginatedData = paginate(jsonData.data, page, pageSize);
console.log(paginatedData);

输出结果如下：

[
  {"id": 6, "name": "Frank", "age": 35},
  {"id": 7, "name": "Grace", "age": 18},
  {"id": 8, "name": "Henry", "age": 27},
  {"id": 9, "name": "Ivy", "age": 23},
  {"id": 10, "name": "Jack", "age": 32}
]

可以看出，函数成功将第二页的数据（ID 为 6 到 10 的数据）返回了出来。