根据数组内对象元素的值进行排序

var arr=[{id:1,name:'xx',age:18},{id:2,name:'xx',age:28},{id:3,name:'xx',age:32},{id:4,name:'xx',age:12},{id:5,name:'xx',age:23}]


function compare(key){
        return function (o1,o2){
            var a=o1[key],
                b=o2[key];
            return a-b
        }
    }

arr.sort(compare('age'))   //compare传入数组内对象元素的key,再将函数传入数组的sort方法，这样就会根据这个key的值对数组进行排序

console.log(arr)

//打印结果：　　（根据了age的大小进行了排序） 

1. [Object, Object, Object, Object, Object]
1. 0:Object
1. age:12
2. id:4
3. name:"xx"
4. __proto__:Object
2. 1:Object
1. age:18
2. id:1
3. name:"xx"
4. __proto__:Object
3. 2:Object
1. age:23
2. id:5
3. name:"xx"
4. __proto__:Object
4. 3:Object
1. age:28
2. id:2
3. name:"xx"
4. __proto__:Object
5. 4:Object
1. age:32
2. id:3
3. name:"xx"
4. __proto__:Object
6. length:5