JS对象序列化为JSON对象的方法

var $ = $ || {};

/**
* 将JS对象序列化为JSON字符串
* @param {Mixed} o The variable to decode
* @return {String} The JSON string
* String json = $.encode(o);
*/
$.encode = (function() {
if ( typeof(JSON)!=='undefined' && typeof(JSON.stringify)!=='undefined') {
return JSON.stringify;
}
var I = !!{}.hasOwnProperty, _ = function(I) {
return I < 10 ? "0" + I : I;
}, A = {
"\b" : "\\b",
"\t" : "\\t",
"\n" : "\\n",
"\f" : "\\f",
"\r" : "\\r",
"\"" : "\\\"",
"\\" : "\\\\"
};
return (function(C) {
if (typeof C == "undefined" || C === null) {
return "null";
} else {
if (Object.prototype.toString.call(C) === "[object Array]") {
var B = ["["], G, E, D = C.length, F;
for (E = 0; E < D; E += 1) {
F = C[E];
switch (typeof F) {
case "undefined" :
case "function" :
case "unknown" :
break;
default :
if (G) {
B.push(",");
}
B.push(F === null ? "null" : $.encode(F));
G = true;
}
}
B.push("]");
return B.join("");
} else {
if ((Object.prototype.toString.call(C) === "[object Date]")) {
return "\"" + C.getFullYear() + "-" + _(C.getMonth() + 1) + "-" + _(C.getDate()) + "T" + _(C.getHours()) + ":" + _(C.getMinutes()) + ":" + _(C.getSeconds()) + "\"";
} else {
if (typeof C == "string") {
return "\"" + C.replace(/([\x00-\x1f\\"])/g, function(B, _) {
var I = A[_];
if (I) {
return I;
}
return '';
}).replace(/[^\u0000-\u00FF]/g, function($0) {
return escape($0).replace(/(%u)(\w{4})/gi, "\\u$2")
}) + "\"";
} else {
if (typeof C == "number") {
return isFinite(C) ? String(C) : "null";
} else {
if (typeof C == "boolean") {
return String(C);
} else {
B = ["{"], G, E, F;
for (E in C) {
if (!I || C.hasOwnProperty(E)) {
F = C[E];
if (F === null) {
continue;
}
switch (typeof F) {
case "undefined" :
case "function" :
case "unknown" :
break;
default :
if (G) {
B.push(",");
}
B.push($.encode(E), ":", $.encode(F));
G = true;
}
}
}
B.push("}");
return B.join("");
}
}
}
}
}
}
});
})();