var data = [
    {name: "王尼玛",sex:1,age: 30},    {name: "王尼美",sex:0,age: 20},    {name: "王大锤",sex:2,age: 30}
];
var str_json = JSON.stringify(data,function (k,v) {
    if (k === "sex") {
        return ["女","男","未知"][v];
    }
    return v;
});
console.log(str_json);

http://www.cnblogs.com/52cik/p/js-json-stringify.html

http://blog.csdn.net/wangxiaohu__/article/details/7254598