In short: you cannot. This is a feature, not a mistake. iOS Safari stops ALL JS and animation on scrolling to save battery life (try scrolling the animated gif page, for example).
I heard you can use hammer.js so that each scroll deals with interactions, which would not mean such reservations. However, it will suck the batteries. Hard
More here: http://eightmedia.imtqy.com/hammer.js/
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