本文详细介绍了如何使用JavaScript将对象序列化为JSON字符串，并解释了JSON字符串如何被解码为页面可识别的对象。包括JSONUtil类的实现细节。
JS对象序列化为JSON对象，如下代码
/**
* JSON 解析类
* 方法：
* 将JSON字符串解码为页面可识别的object对象
* @param {String} json The JSON string
* @return {Object} The resulting object
* Object o = JSONUtil.decode(json);
*
* 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 = JSONUtil.encode(o);
*/
var JSONUtil;
if (!JSONUtil) {
JSONUtil = {};
}
JSONUtil.decode = function(json) {
try {
return eval("\u0028" + json + '\u0029');
} catch (exception) {
return eval("\u0075\u006e\u0064\u0065\u0066\u0069\u006e\u0065\u0064");
}
};
JSONUtil.encode = (function() {
var $ = !!{}.hasOwnProperty, _ = function($) {
return $ < 10 ? "0" + $ : $
}, A = {
"\b" : "\\b",
"\t" : "\\t",
"\n" : "\\n",
"\f" : "\\f",
"\r" : "\\r",
"\"" : "\\\"",
"\\" : "\\\\"
};
return (function(C) {
if (typeof C == "\u0075\u006e\u0064\u0065\u0066\u0069\u006e\u0065\u0064" C === null)
return "null";
else if (Object.prototype.toString.call(C) === "\u005b\u006f\u0062\u006a\u0065\u0063\u0074\u0020\u0041\u0072\u0072\u0061\u0079\u005d") {
var B = ["\u005b"], G, E, D = C.length, F;
for (E = 0; E < D; E += 1) {
F = C[E];
switch (typeof F) {
case "\u0075\u006e\u0064\u0065\u0066\u0069\u006e\u0065\u0064" :
case "\u0066\u0075\u006e\u0063\u0074\u0069\u006f\u006e" :
case "\u0075\u006e\u006b\u006e\u006f\u0077\u006e" :
break;
default :
if (G)
B.push("\u002c");
B.push(F === null ? "null" : this.encode(F));
G = true
}
}
B.push("\u005d");
return B.join("")
} else if ((Object.prototype.toString.call(C) === "\u005b\u006f\u0062\u006a\u0065\u0063\u0074\u0020\u0044\u0061\u0074\u0065\u005d"))
return "\"" + C.getFullYear() + "-" + _(C.getMonth() + 1) + "-" + _(C.getDate()) + "T" + _(C.getHours()) + ":" + _(C.getMinutes()) + ":" + _(C.getSeconds()) + "\"";
else if (typeof C == "\u0073\u0074\u0072\u0069\u006e\u0067") {
if (/["\\\x00-\x1f]/.test(C))
return "\"" + C.replace(/([\x00-\x1f\\"])/g, function(B, _) {
var $ = A[_];
if ($)
return $;
$ = _.charCodeAt();
return "\\u00" + Math.floor($ / 16).toString(16) + ($ % 16).toString(16)
}) + "\"";
return "\"" + C + "\""
} else if (typeof C == "\u006e\u0075\u006d\u0062\u0065\u0072")
return isFinite(C) ? String(C) : "null";
else if (typeof C == "\u0062\u006f\u006f\u006c\u0065\u0061\u006e")
return String(C);
else {
B = ["\u007b"], G, E, F;
for (E in C)
if (!$ C.hasOwnProperty(E)) {
F = C[E];
if (F === null)
continue;
switch (typeof F) {
case "\u0075\u006e\u0064\u0065\u0066\u0069\u006e\u0065\u0064" :
case "\u0066\u0075\u006e\u0063\u0074\u0069\u006f\u006e" :
case "\u0075\u006e\u006b\u006e\u006f\u0077\u006e" :
break;
default :
if (G)
B.push("\u002c");
B.push(this.encode(E), "\u003a", this.encode(F));
G = true
}
}
B.push("\u007d");
return B.join("")
}
})
})();
window.JSONUtil = JSONUtil;
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