How to pass a parameter to Vue @click event handler
Solution 1:
Just use a normal Javascript expression, no {} or anything necessary:
@click="addToCount(item.contactID)"
if you also need the event object:
@click="addToCount(item.contactID, $event)"
Solution 2:
When you are using Vue directives, the expressions are evaluated in the context of Vue, so you don't need to wrap things in {}.
@click is just shorthand for v-on:click directive so the same rules apply.
In your case, simply use @click="addToCount(item.contactID)"