JavaScript中对数组的排序

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mb5fca0b6a49e47 2019-07-15 10:09:00

文章标签 数组对象数组 html 字符编码函数返回值 文章分类 Html/CSS 前端开发

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：

        会操作原始数组，经过操作后原始数组发生变化



        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"));
        　　




        貌似不正确ing