let fs = require('fs');
var express = require('express')

// 读取JSON数据
let jsonStr = fs.readFileSync('./data.json', {
  encoding: 'utf8'
});

let data = JSON.parse(jsonStr);

// 创建Web服务器对象
var app = express();

// 静态资源处理
app.use(express.static('public'));

app.get('/data', (req, res) => {
  let [ ...arr ] = data
  let start = (req.query.page - 1) * req.query.pageSize;
  res.setHeader('X-Total-Count', data.length);
  res.send(arr.splice(start, req.query.pageSize));
});

app.listen(3000, () => {
  console.log('服务器启动成功，地址为：http://127.0.0.1:3000');
});