-menu
     |-A
       |-1
       |-2
     |-B
       |-1
       |-2
     |-C
     |-D
     |-E
 menukeepalivemetakeepalive

question 1.

 A keepalive:true, 12
 Arouterview12metakeepalive
 1  keepalive:true 2  keepalive:false
 Apost1post2  /A/1get1   /A/2get2
 Apost1, post2,B
 /A/1 get1
 /A/2  post1post2get2
 /A/2get2keepalive   

question 2.

BC keepalive:true 12B/B/2
/B/2postb2
D,E keepalive:false
/B/2/C,/D,/E
/B/2  /D,/E postb2 
/D, /E/B/2postb2 
/b/2  keepalive:false