Question

我有需要循环的JSON数据。数据位于标题为＆＃34; people.json＆＃34;其结构如下：

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

我想读取此文件中的每个对象并保存（我使用Mongoose）。以下是我到目前为止的情况：

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) {});
    }
});

我虽然无法让这个工作。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) {});
  }
});

Answer 2

ES6 for..of也可以这样做。

fs.readFile('./people.json', 'utf8', function (err,data) {
  for(var item of data) {
     console.log('item: ', [item.firstname, ...]);
  }
});

如何遍历JSON对象数组？

2 个答案: