function?val=jsonopt（keydefaultvarargin）
%
%?val=jsonopt（keydefaultoptstruct）
%
%?setting?options?based?on?a?struct.?The?struct?can?be?produced
%?by?varargin2struct?from?a?list?of?‘param‘‘value‘?pairs
%
%?authors:Qianqian?Fang?（q.fang??neu.edu）
%
%?$Id:?loadjson.m?371?2012-06-20?12:43:06Z?fangq?$
%
%?input:
%??????key:?a?string?with?which?one?look?up?a?value?from?a?struct
%??????default:?if?the?key?does?not?exist?return?default
%??????optstruct:?a?struct?where?each?sub-field?is?a?key?
%
%?output:
%??????val:?if?key?exists?val=optstruct.key;?otherwise?val=default
%
%?license:
%?????BSD?or?GPL?version?3?see?LICENSE_{BSDGPLv3}.txt?files?for?details
%
%?--?this?function?is?part?of?jsonlab?toolbox?（http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab）
%?

val=default;
if（nargin<=2）?ret

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-09-06?17:01??jsonlab-master\
?????文件?????????395??2017-09-06?17:01??jsonlab-master\.gitignore
?????文件????????2028??2017-09-06?17:01??jsonlab-master\AUTHORS.txt
?????文件????????5571??2017-09-06?17:01??jsonlab-master\ChangeLog.txt
?????文件????????1542??2017-09-06?17:01??jsonlab-master\LICENSE_BSD.txt
?????文件???????36299??2017-09-06?17:01??jsonlab-master\LICENSE_GPLv3.txt
?????文件???????21977??2017-09-06?17:01??jsonlab-master\README.rst
?????文件???????20597??2017-09-06?17:01??jsonlab-master\README.txt
?????目錄???????????0??2017-09-06?17:01??jsonlab-master\examples\
?????文件????????6453??2017-09-06?17:01??jsonlab-master\examples\demo_jsonlab_basic.m
?????文件????????6517??2017-09-06?17:01??jsonlab-master\examples\demo_ubjson_basic.m
?????文件?????????436??2017-09-06?17:01??jsonlab-master\examples\example1.json
?????文件?????????583??2017-09-06?17:01??jsonlab-master\examples\example2.json
?????文件?????????272??2017-09-06?17:01??jsonlab-master\examples\example3.json
?????文件?????????563??2017-09-06?17:01??jsonlab-master\examples\example4.json
?????文件???????10005??2017-09-06?17:01??jsonlab-master\examples\jsonlab_basictest.matlab
?????文件?????????995??2017-09-06?17:01??jsonlab-master\examples\jsonlab_selftest.m
?????文件????????4387??2017-09-06?17:01??jsonlab-master\examples\jsonlab_selftest.matlab
?????文件?????????675??2017-09-06?17:01??jsonlab-master\examples\jsonlab_speedtest.m
?????文件?????????984??2017-09-06?17:01??jsonlab-master\jsonopt.m
?????文件???????16691??2017-09-06?17:01??jsonlab-master\loadjson.m
?????文件???????13289??2017-09-06?17:01??jsonlab-master\loadubjson.m
?????文件?????????786??2017-09-06?17:01??jsonlab-master\mergestruct.m
?????文件?????????544??2017-09-06?17:01??jsonlab-master\package.json
?????文件???????19101??2017-09-06?17:01??jsonlab-master\savejson.m
?????文件???????17768??2017-09-06?17:01??jsonlab-master\saveubjson.m
?????文件????????3526??2017-09-06?17:01??jsonlab-master\struct2jdata.m
?????文件????????1116??2017-09-06?17:01??jsonlab-master\varargin2struct.m