javascript数组排序函数

/*
@desc：表格排序类
@param data 待排序数组
*/
function tablesort(data){
this.data = data
this.sortby = true
/*
 @desc：主方法，排序
 @param item 排序字段
 @return ret 排序后的数据
 */
this.sort = function(item){
    if(this.sortby){
        var ret = this.data.sort(function(a,b){
            return a[item]>b[item]
        })
    }else{
        var ret = this.data.sort(function(a,b){
            return a[item]<b[item]
        })
    }
    this.sortby = !this.sortby
    return ret
}
}

var data = new Array(
 {
     id:1,
     title:‘title1‘,
     content:‘content1‘
 },
 {
     id:3,
     title:‘title2‘,
     content:‘content3‘
 },
 {
     id:2,
     title:‘title3‘,
     content:‘content2‘
 }
)
var tablesort = new tablesort(data)
var ret = tablesort.sort(‘id‘)
console.log(ret)
var ret = tablesort.sort(‘title‘)
console.log(ret)
var ret = tablesort.sort(‘id‘)
console.log(ret)

[ { id: 1, title: ‘title1‘, content: ‘content1‘ },
{ id: 2, title: ‘title3‘, content: ‘content2‘ },
{ id: 3, title: ‘title2‘, content: ‘content3‘ } ]
[ { id: 2, title: ‘title3‘, content: ‘content2‘ },
{ id: 3, title: ‘title2‘, content: ‘content3‘ },
{ id: 1, title: ‘title1‘, content: ‘content1‘ } ]
[ { id: 1, title: ‘title1‘, content: ‘content1‘ },
{ id: 2, title: ‘title3‘, content: ‘content2‘ },
{ id: 3, title: ‘title2‘, content: ‘content3‘ } ]