json sort排序

Array.sort()方法是用來對數組項進行排序的 ，默認情況下是進行升序排列。sort() 方法可以接受一個 方法為參數。

sort()排序時每次比較兩個數組項都回執行這個參數，並把兩個比較的數組項作為參數傳遞給這個函數。當函數返回值為1的時候就交換兩個數組項的順序，否則就不交換。

  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)

 寫成類

    <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
                    }//通過eval對json對象的鍵值傳參
                    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)
                }//遍歷添加dom元素，添加dom
            }

            function _temp() {
                this.init.apply(this, arguments)
            }

            _temp.prototype = tablesort;
            var sort1 = new _temp(p, "price", "down") //建立對象
            sort1.init(p, "age", "up");//初始化參數更改
            sort1.sot()
            sort1.prin()

        })


    </script>