JavaScript中对象数组 根据某个属性值进行排序

将下列对象数组，通过工资属性，由高到低排序

 

var BaiduUsers = [], WechatUsers = [];

var User = function(id, name, phone, gender, age, salary) {
this.id = id;
this.name = name;
this.phone = phone;
this.gender = gender;
this.age = age;
this.salary = salary;
};
User.create = function(id, name, phone, gender, age, salary) {
return new User(id, name, phone, gender, age, salary);
};
BaiduUsers.push(User.create(1, 'tommy', '1111','male', 18, 2800));
BaiduUsers.push(User.create(2, 'jerry', '2222','male', 28, 5800));
BaiduUsers.push(User.create(3, 'raobin','3333','female', 14, 1200));
BaiduUsers.push(User.create(4, 'binbin','4444','male', 23, 9800));
BaiduUsers.push(User.create(5, 'arthur','5555','female', 22, 3000));
WechatUsers.push(User.create(1, 'tommy', '1111','male', 20, 4000));
WechatUsers.push(User.create(2, 'allen', '6666','male', 34, 15800));
WechatUsers.push(User.create(3, 'raobin','3333','female', 16, 2300));
WechatUsers.push(User.create(4, 'harvey','7777','male', 30, 29800));
WechatUsers.push(User.create(5, 'yuyu', '8888','female', 27, 7000));

　　 

对于一般的数组，可以用sort函数，对于对象数组呢

var points = [40,100,1,5,25,10];
points.sort(function(a,b){return a-b});

 

那么考点在哪里呢？实际上在于数组对象的sort方法。

Array.sort(fun)

fun是一个函数，排序根据这个函数返回值来进行判断，如果返回值小于0表示两个元素不需要交换位置，1表示要用交互位置，0表示相等，实际上<=0等效。

sort方法有两个注意点：

1. 会操作原始数组，经过操作后原始数组发生变化
2. 默认排序按照字符编码排序，例如，我们有下面的一个例子：

 https://www.cnblogs.com/webcabana/p/7460038.html

 

需要定义下sortBy方法，然后进行调用即可

 BaiduUsers.sort(sortBy("salary"))

如果存在工资相等的情况，要求按照年纪排序，应该如何定义SortBY方法呢？

var BaiduUsers = [], WechatUsers = [];
var User = function(id, name, phone, gender, age, salary) {
this.id = id;
this.name = name;
this.phone = phone;
this.gender = gender;
this.age = age;
this.salary = salary;
};
User.create = function(id, name, phone, gender, age, salary) {
return new User(id, name, phone, gender, age, salary);
};
BaiduUsers.push(User.create(1, 'tommy', '1111','male', 18, 10000));
BaiduUsers.push(User.create(2, 'jerry', '2222','male', 28, 10000));
BaiduUsers.push(User.create(3, 'raobin','3333','female', 14, 1200));
BaiduUsers.push(User.create(4, 'binbin','4444','male', 23, 9800));
BaiduUsers.push(User.create(5, 'arthur','5555','female', 22, 10000));

 

 

 

function sortBy(field1,field2) {
    return function(a,b) {
        if(a.field1 == b.field1) return a.field2 - b.field2;
        return a.field1 - b.field1;
    }
}

BaiduUsers.sort(sortBy("salary","age"));

　　

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