自定義的函數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;                 }             }         }聲明一個數組：var data = [{name:"a",age:28},{name:"b",age:18}];調用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行注釋，按照age排序中是正常的console.log(data); //=> [{name:"b",age:18},{name:"a",age:28}]不理解紅色的地方，求高手解答。