JSON.stringify 应用

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"]}‘ 
*/