json sort

Array.sort()方法是用来对数组项进行排序的 ，默认情况下是进行升序排列。sort() 方法可以接受一个 方法为参数。

sort()排序时每次比较两个数组项都回执行这个参数，并把两个比较的数组项作为参数传递给这个函数。当函数返回值为1的时候就交换两个数组项的顺序，否则就不交换。

var p = [5, 2, 3, 1, 7, 5, 6, 9, 6, 0];

          function down(a, b) {

              return   (a < b) ? 1 : -1

          }

          p.sort(down)

          alert(p)

 json排序

var p = [

            {name:"kitty", age:12},

            {name:"sonny", age:9},

            {name:"jake", age:13},

            {name:"fun", age:24}

        ]

        function down(x, y) {

            return (x.age < y.age) ? 1 : -1

 

        }

        p.sort(down)

        var $text = "<div>"

        $.each(p, function (key, value) {

            var $div = "<div>"

            $.each(value, function (key, value) {

                $div += "<span>" + key + ":</span>" + "<span>" + value + "</span>" + "         "

            })

            $div += "</div>"

            $text = $text + $div

        })

        $text += "</div>"

 

 

 

        $(".text").html($text)

 写成类

<script type="text/javascript">

    $(document).ready(function () {

        var p = [

            {name:"kitty", age:12, price:190},

            {name:"sonny", age:9, price:390},

            {name:"jake", age:13, price:42},

            {name:"fun", age:24, price:210}

        ]

 

        var tablesort = {

            init:function (arry, parm, sortby) {

                this.obj = arry

                this.parm = parm

                this.b = sortby

            },

 

            sot:function () {

                var $this = this

                var down = function (x, y) {

                    return (eval("x." + $this.parm) > eval("y." + $this.parm)) ? -1 : 1

                }//通过eval对json对象的键值传参

                var up = function (x, y) {

                    return (eval("x." + $this.parm) < eval("y." + $this.parm)) ? -1 : 1

                }

                if (this.b == "down") {

                    this.obj.sort(down)

                }

                else {

                    this.obj.sort(up)

                }

 

            },//排序

 

            prin:function () {

                var $text = "<div>"

                $.each(this.obj, function (key, value) {

                    var $div = "<div>"

                    $.each(value, function (key, value) {

                        $div += "<span>" + key + ":</span>" + "<span>" + value + "</span>" + "         "

                    })

                    $div += "</div>"

                    $text = $text + $div

                })

                $text += "</div>"

                $("html body").html($text)

            }//遍历添加dom元素，添加dom

        }

 

        function _temp() {

            this.init.apply(this, arguments)

        }

 

        _temp.prototype = tablesort;

        var sort1 = new _temp(p, "price", "down") //建立对象

        sort1.init(p, "age", "up");//初始化参数更改

        sort1.sot()

        sort1.prin()

 

    })

 

 

</script>