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我有一个json文件employees.json,我想将数据附加到此对象.该文件如下所示:

var txt = '{"employees":[' +
'{"firstName":"Jerry","lastName":"Negrell","time":"9:15 am","email":"jerry@bah.com","phone":"800-597-9405","image":"images/jerry.jpg" },' +
'{"firstName":"Ed","lastName":"Snide","time":"9:00 am","email":"edward@bah.com","phone":"800-597-9406","image":"images/ed.jpg" },' +
'{"firstName":"Pattabhi","lastName":"Nunn","time":"10:15 am","email":"pattabhi@bah.com","phone":"800-597-9407","image":"images/pattabhi.jpg" }'+
']}';

我想补充一下:

• 姓:麦克
• 名字:车辙
• 时间:上午10点
• 电子邮件:rut@bah.com
• 电话:800-888-8888
• 图像:图像/ mike.jpg

到employee.json.

我怎么做到这一点？