公用方法解析后台json 回值的object/List 的内容

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(',') + '}';    }