js数组中对象排序问题

Question

自定义的函数

function outFn(arg){            return function(obj1,obj2){                var value1 = obj1[arg];                var value2 = obj2[arg];                if(value1<value2){                    return -1;
                }else if(value1>value2){                    return 1;
                }else{                    return 0;
                }
            }
        }

声明一个数组：

var data = [{name:"a",age:28},{name:"b",age:18}];

调用data.sort()方法后

data.sort(outFn("age"));     //按照age排序
          console.log(data);          //=>[{name:"a",age:28},{name:"b",age:18}]
          console.log(data[0].age);   //=>18         
        data.sort(outFn("name"));    //按照name排序
        console.log(data);           //=>[{name:"a",age:28},{name:"b",age:18}]
        console.log(data[0].age);   //=>28

把最后3行注释，按照age排序中是正常的

console.log(data); //=> [{name:"b",age:18},{name:"a",age:28}]

不理解红色的地方，求高手解答。

Answer 1

console.log打印在控制台的值，是点击控制台后计算得到的(也就是最后生成的)，developer tools已经提示清楚了“Value below was evaluated just now"，另外console在MDN上标明不是标准,各个浏览器实现方式不一样,你可以试一下console.table(data)就知道了，要打印及时值应该console.log(JSON.stringify(data));