/*对象*/    function JsonSort(obj, field, sortby) {        this.obj = obj;        this.field = field;        this.sortby = sortby;    }    JsonSort.prototype.sort= function() {        var $this=this;        var ascend = function(a, b) {            return a[$this.field] > b[$this.field] ? 1 : -1;        };        var descend = function(a, b) {            return a[$this.field] > b[$this.field] ? -1 : 1;        };        if (this.sortby == "ascend") {            this.obj.sort(ascend);        } else {            this.obj.sort(descend);        }    };    var json = [{        name: 'kavan',        age: 25    }, {        name: 'elle',        age: 24    }, {        name: 'jek',        age: 22    }];    var jsonSort=new JsonSort(json,'age','ascend');    jsonSort.sort();    console.log(json);