[Vuejs]-Add data to array delete other content

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try using push as a function, and passing the new object to push as a parameter:

const addItemCart = ref([])
const addToCart = (event) => {
    let itemId = event.target.id
    let itemName = event.target.name
    let category = event.target.getAttribute("data-category")
          
    addItemCart.value.push({ id: itemId, name: itemName, category: category })
    //here we push the new item as an object into `addItemCart.value`
}

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