淺析Js(Jquery)中,字符串與JSON格式互相轉換的示例

這幾天，遇到了json格式在JS和Jquey的環境中，需要相互轉換，在網上查了一下，大多為缺胳膊少腿，也許咱是菜鳥吧，終於測試成功後，還是給初學者們一個實例吧  

首先，准備新建一個js文件。以下是JSON2.js的內容，把內容拷到js文件中，以便調用：

復制代碼 代碼如下:
/*
    http://www.JSON.org/json2.js
    Public Domain.
    NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
    See http://www.JSON.org/js.html
    This code should be minified before deployment.
    See http://javascript.crockford.com/jsmin.html
    USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
    NOT CONTROL.
    This file creates a global JSON object containing two methods: stringify
    and parse.
        JSON.stringify(value, replacer, space)
            value       any JavaScript value, usually an object or array.
            replacer    an optional parameter that determines how object
                        values are stringified for objects. It can be a
                        function or an array of strings.
            space       an optional parameter that specifies the indentation
                        of nested structures. If it is omitted, the text will
                        be packed without extra whitespace. If it is a number,
                        it will specify the number of spaces to indent at each
                        level. If it is a string (such as 't' or ' '),
                        it contains the characters used to indent at each level.
            This method produces a JSON text from a JavaScript value.
            When an object value is found, if the object contains a toJSON
            method, its toJSON method will be called and the result will be
            stringified. A toJSON method does not serialize: it returns the
            value represented by the name/value pair that should be serialized,
            or undefined if nothing should be serialized. The toJSON method
            will be passed the key associated with the value, and this will be
            bound to the value
            For example, this would serialize Dates as ISO strings.
                Date.prototype.toJSON = function (key) {
                    function f(n) {
                        // Format integers to have at least two digits.
                        return n < 10 ? '0' + n : n;
                    }
                    return this.getUTCFullYear()   + '-' +
                         f(this.getUTCMonth() + 1) + '-' +
                         f(this.getUTCDate())      + 'T' +
                         f(this.getUTCHours())     + ':' +
                         f(this.getUTCMinutes())   + ':' +
                         f(this.getUTCSeconds())   + 'Z';
                };
            You can provide an optional replacer method. It will be passed the
            key and value of each member, with this bound to the containing
            object. The value that is returned from your method will be
            serialized. If your method returns undefined, then the member will
            be excluded from the serialization.
            If the replacer parameter is an array of strings, then it will be
            used to select the members to be serialized. It filters the results
            such that only members with keys listed in the replacer array are
            stringified.
            Values that do not have JSON representations, such as undefined or
            functions, will not be serialized. Such values in objects will be
            dropped; in arrays they will be replaced with null. You can use
            a replacer function to replace those with JSON values.
            JSON.stringify(undefined) returns undefined.
     &nbs