json - 如何循环遍历 JSON 对象数组？

Question

我有需要循环的 JSON 数据。数据位于名为“people.json”的文件中，其结构如下:

[{"firstname":"John","lastname":"Smith","age":"40"},{"firstname":"Bill","lastname":"Jones","age":"40"}, ...]

我想读取这个文件中的每个对象并保存它(我正在使用 Mongoose)。这是我目前所拥有的:

var fs = require('fs');
var Person = require('../models/people');

fs.readFile('./people.json', 'utf8', function (err,data) {
    var i;
    for(i = 0; i < data.length; i++) {
        var newPerson = new Person();
        newPerson.firstname = data[i].firstname;
        newPerson.lastname = data[i].lastname;
        newPerson.age = data[i].age;
        newPerson.save(function (err) {});
    }
});

我无法让它工作。我做错了什么？

Answer 1

fs.readFile('./people.json', 'utf8', function (err,data) {
  data = JSON.parse(data); // you missed that...
  for(var i = 0; i < data.length; i++) {
    var newPerson = new Person();
    newPerson.firstname = data[i].firstname;
    newPerson.lastname = data[i].lastname;
    newPerson.age = data[i].age;
    newPerson.save(function (err) {});
  }
});