** 
* json对象转字符串形式 
*/ 
function json2str(o) { 
var arr = []; 
var fmt = function(s) { 
if (typeof s == ‘object‘ && s != null) return json2str(s); 
return /^(string|number)$/.test(typeof s) ? "‘" + s + "‘" : s; 
} 
for (var i in o) arr.push("‘" + i + "‘:" + fmt(o[i])); 
return ‘{‘ + arr.join(‘,‘) + ‘}‘; 
} 

 <script src="~/Scripts/json2.js"></script>

var jsonDetail =  {
                Content : "我爱北京*",
                Type:"1"
            };

var  Content = JSON.stringify(jsonDetail)   //这里要把 jsonDetail 给序列化为 字符串