register not support variable

now . I has run two comands and register the two variable , when I call the variable , the variable Unavailable (undefined)

flowing is my playbook:

The value of register can not be a variable. You must statically define it such as:

register: cange

Additionally, ‘register’ works a little differently with loops such as with_items. See <http://docs.ansible.com/playbooks_loops.html#using-register-with-a-loop>