javascript - If class other than my class is present -

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i have dynamic list looks 

<li>item 1</li> <ii>item 2</li> <ii class="route2">item 2</li> <ii>item 3</li> <ii>item 4</li>

and 2 buttons 

<button>route one</button> <button>route two</button>

i can't work how show route 2 button if list items have route2 class.

this should work:

if ( $('li').not('.route2').length ){     $('button').hide(); }

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