3 dice in the javascript

Sorry guys I don't know how to post the html code at here. I have make some rules for the dice , but I really dont know how to make the last dice rules:straight

the straight rules means : dice1 = 1, dice2 =2, dice3 =3 (123) and 123,234,345,456

And I also make javascript know that if dice1 = 1 , dice2 = 3 , dice3 = 2(132) , (132)also named as straight ..