将 JavaScript 值转换为 JavaScript 对象表示法 (Json) 字符串。

此示例使用 JSON.stringify 将contact对象转换为 JSON 文本。    
定义memberfilter数组以便只转换

surname和phone成员。    
省略firstname成员。


var contact = new Object();

contact.firstname = "Jesper";

contact.surname = "Aaberg";

contact.phone = ["555-0100", "555-0120"]; 

var memberfilter = new Array();

memberfilter[0] = "surname";

memberfilter[1] = "phone";

var jsonText = JSON.stringify(contact, memberfilter, "\t");

document.write(jsonText);

// Output:

// { "surname": "Aaberg", "phone": [ "555-0100", "555-0120" ] }

示例

此示例将 JSON.stringify 与一个数组一起使用。

replaceToUpper

函数将数组中的每个字符串转换为大写形式。

var continents = new Array();

continents[0] = "Europe";

continents[1] = "Asia";

continents[2] = "Australia";

continents[3] = "Antarctica";

continents[4] = "North America";

continents[5] = "South America";

continents[6] = "Africa"; 

var jsonText = JSON.stringify(continents, replaceToUpper); 

function replaceToUpper(key, value) {

    return value.toString().toUpperCase();

} 

//Output:

// "EUROPE,ASIA,AUSTRALIA,ANTARCTICA,NORTH AMERICA,SOUTH AMERICA,AFRICA"

示例

此示例使用 toJSON 方法将字符串值转换为大写形式。

var contact = new Object();

contact.firstname = "Jesper";

contact.surname = "Aaberg";

contact.phone = ["555-0100", "555-0120"]; 

contact.toJSON = function(key)

 {

    var replacement = new Object();

    for (var val in this)

    {

        if (typeof (this[val]) === 'string')

            replacement[val] = this[val].toUpperCase();

        else

            replacement[val] = this[val]

    }

    return replacement;

}; 

var jsonText = JSON.stringify(contact);

document.write(jsonText); 

// Output:

{"firstname":"JESPER","surname":"AABERG","phone":["555-0100","555-0120"]}  

'{"firstname":"JESPER","surname":"AABERG","phone":["555-0100","555-0120"]}'

*/