让某些浏览器支持JSON.stringify

        function forIn(obj, handler) {
            for (var i in obj) {
                if (obj.hasOwnProperty(i)) {
                    handler(i, obj[i]);
                }
            }
        }
        function each(arr, handler) {
            for (var i = 0, len = arr.length; i < len; i += 1) {
                handler(i, arr[i]);
            }
        }
        if (!JSON) {
            JSON = {};
        }
        if (!JSON.parse) {
            JSON.parse = function (json) {
                return eval('1,' + json)
            };
        }
        if (!JSON.stringify) {
            (function (JSON) {
                var arr = '[object Array]',
                    obj = '[object Object]';

                JSON.stringify = function (json) {
                    var t = '';
                    var m = Object.prototype.toString.call(json);
                    if (m == arr) {
                        t = ArrPartten(json);
                    } else if (m == obj) {
                        t = ObjectJson(json);
                    } else {
                        t = json;
                    }
                    return t;
                }

                function ObjectParse() {
                    var t = '{';
                    forIn(json, function (i, ele) {
                        var m = Object.prototype.toString.call(ele);
                        if (m == arr) {
                            t += i + ':' + ArrPartten(ele) + ',';
                        } else if (m == obj) {
                            t += i + ':' + ObjectJson(ele) + ',';
                        } else {

                            t += i + ':' + ele + ',';
                        }
                    });
                    if (t.length != 1) {
                        t = t.substring(0, t.length - 1);
                    }
                    return t + '}';
                }

                function ArrayParse() {
                    var t = '[';
                    each(json, function (i, ele) {
                        var m = Object.prototype.toString.call(ele);
                        if (m == arr) {
                            t += ArrPartten(ele) + ',';
                        } else if (m == obj) {
                            t += ObjectJson(ele) + ',';
                        } else {
                            t += ele + ',';
                        }
                    });
                    if (json.length > 0) {
                        t = t.substring(0, t.length - 1);
                    }
                    return t + ']';
                }
            }(JSON));
        }