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我有一个数组(请参阅下面的数组中的一个对象),我需要使用JavaScript对firstname进行排序.我该怎么做？

var user = {
   bio: null,
   email:  "user@domain.com",
   firstname: "Anna",
   id: 318,
   lastAvatar: null,
   lastMessage: null,
   lastname: "Nickson",
   nickname: "anny"
};

假设你有一个像这样的javascript类

var DepartmentFactory = function(data) {
    this.id = data.Id;
    this.name = data.DepartmentName;
    this.active = data.Active;
}

假设您创建了该类的多个实例并将它们存储在一个数组中

var objArray = [];
objArray.push(DepartmentFactory({Id: 1, DepartmentName: 'Marketing', Active: true}));
objArray.push(DepartmentFactory({Id: 2, DepartmentName: 'Sales', Active: true}));
objArray.push(DepartmentFactory({Id: 3, DepartmentName: 'Development', Active: true}));
objArray.push(DepartmentFactory({Id: 4, DepartmentName: 'Accounting', Active: true}));

所以我现在将创建一个由对象创建的对象数组DepartmentFactory.我如何使用该array.sort()方法按DepartmentName每个对象的属性对这个对象数组进行排序？

array.sort()排序字符串数组时,该方法可以正常工作

var myarray=["Bob", "Bully", "Amy"];
myarray.sort(); //Array now becomes ["Amy", "Bob", "Bully"]

但是如何使它与对象列表一起使用？