javascript - JSON类数组对象，添加项目

Question

我有一个 JSON 文件，其中包含:

[{"id":1,"first_name":"Judith","email":"jshaw0@wikipedia.org"},
{"id":2,"first_name":"Sarah","email":"sross1@infoseek.co.jp"},
{"id":3,"first_name":"Dorothy","email":"dgreene2@posterous.com"},
{"id":4,"first_name":"Christine","email":"cnichols3@techcrunch.com"},
{"id":5,"first_name":"Theresa","email":"trogers4@xrea.com"},
{"id":6,"first_name":"Rebecca","email":"rpeterson5@mlb.com"},
{"id":7,"first_name":"Chris","email":"cbailey6@yellowpages.com"},
{"id":8,"first_name":"Howard","email":"hbailey7@miibeian.gov.cn"},
{"id":9,"first_name":"Sara","email":"ssimpson8@techcrunch.com"},
{"id":10,"first_name":"Lois","email":"lmartinez9@dion.ne.jp"},
{"id":11,"first_name":"Jeffrey","email":"jhalla@intel.com"},
{"id":12,"first_name":"Teresa","email":"tcampbellb@usnews.com"},
{"id":13,"first_name":"Susan","email":"skingc@wired.com"},
{"id":14,"first_name":"Richard","email":"rpattersond@omniture.com"},
{"id":15,"first_name":"Ronald","email":"rgreenee@wordpress.org"}]

我想向其中添加一个元素，但我不知道如何添加。 我有以下 Node 代码:

var jsonfile = require('jsonfile');
var util = require('util');

var file = 'data.json';
var jsonObj = {};
jsonfile.readFile(file, function(err, obj) {
    jsonObj = obj;

    new_obj = {"id":16,"first_name":"Florin","email":"popflorin1705@yahoo.com"};
    //jsonObj.push(new_obj)
    console.log(typeof jsonObj);

    /*jsonfile.writeFile(file, jsonObj, function (err) {
      console.error(err)
    })*/
});

我尝试使用push方法，但显然不起作用，因为它是一个对象而不是数组，即使它看起来像一个数组。在对象(或数组 - 我很困惑)末尾添加另一行的好方法是什么？

Answer 1

我相信您忘记解析 JSON。阅读该文件后，您的代码应该是:

jsonObj = JSON.parse(obj);

而不是直接赋值。