How to deploy a dynamic object using CloudDeploy

I want to deploy a dynamic object by CloudDeploy,which can update by the time interval, i check the help doc and find the method: enter image description here So i try this method but it seems not work as expected,the displayed result is fixed when i open the link,here is the code:

CloudDeploy[Dynamic[RandomReal[],UpdateInterval -> 1], Permissions -> "Public"] # CloudObject["\d257ecbbaa4b"] 

Is there anybody can help me?thanks.