Question

我有一个包含以下内容的JSON文件：

[{"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"}]

我想再添加一个元素，但我无法弄清楚如何。我有以下节点代码：

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一个数组，即使它看起来像一个数组。哪个是在对象末尾添加另一行的好方法（或数组 - 我很困惑）？

Answer 1

我相信你忘了解析JSON。阅读完文件后，您的代码应为：

jsonObj = JSON.parse(obj);

而不是直接分配。

Answer 2

声明变量

 var new_obj = {"id":16,"first_name":"Florin","email":"popflorin1705@yahoo.com"};

然后使用push()已经完成了。试试看。仅当obj是json对象时，它才会起作用。

JSON数组类对象，添加项

2 个答案: