study_express/3-qula/02-splice.js

const fs = require('fs');
let xindaming = require('./xindaming');

xindaming = xindaming.splice(12, xindaming.length);

xindaming.map((key, i) => {
  key.index = i + 1;
});

fs.writeFileSync('./xindaming.js', `module.exports = ${JSON.stringify(xindaming)}`);