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Based on the comments and also Michal Levý’s comment, I think what you are looking for is this:
<div class = 'bestsellers-item' v-for = '(item, index) in items': key = 'index'>
<div class = 'bestsellers-item__sticker'>
<img: src = 'item.img'>
</div>
<button @click="addCartItem(item.id)">Add to cart</button>
</div>
And then, your function:
addCartItem(itemId) {
console.log("Do something with item " + itemId);
}
Source:stackexchange.com