%9-6  ʹûӶChildren ļͼεĲνṹҵҪĶ

>> x=-pi:pi/20:pi;
>> y=sin(x);z=cos(x);
>> plot(x,y,'r' ,x,z,'g');
>> Hl_lines=get(gca, 'Children');
>> for k=1:size(Hl_lines)
Hl_green=Hl_lines(k);
end
end
>>Hl_green
Hl_green =
  153.0022
Hl_green =
  151.0038
>>

%ּЧںܶͱøӡüҲʧ˱־еı󣬳Щ
%жͼΣÿͼжʱʹ³ɫľ⡣
>> Hf_all=get(0, Children );  %  get all figure handles
>> for k=1:length(Hf_all)
>> Ha_all=[Ha_all;get(Hf_all(k), Children )];  %  get all axes handles
>>end
>>for k=1:length(Ha_all)
>>  Hx_all=[Hx_all;get(Ha_all(k), Children )];  %  get axes child handles
>>end
>>for k=1:length(Hx_all)
>>if get(Hx_all(k), Type )== line 
>> Hl_all=[Hl_all;Hx_all(k)];  %  get line handles only
>>    end
>>    end
>> for  k=1:length(Hl_all)
>>   if get(Hl_all(k), Color )==[0 1 0]
>>     Hl_green=[Hl_green;Hl_all(k)];  %  find green ones
>>   end
>> end
