Vue Js push to array with key

<!DOCTYPE html>
<html>
<head>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <table>
            <h3>Vue Js push to array with key</h3>
            <thead>
                <tr>
                    <th>ID</th>
                    <th>Name</th>
                </tr>
            </thead>
            <tbody>
                <tr v-for="(item, index) in items" :key="item.id">
                    <td>{{ item.id }}</td>
                    <td>{{ item.name }}</td>
                </tr>
            </tbody>
        </table>
        <form @submit.prevent="addItem">
            <label for="itemName">Item Name:</label>
            <input type="text" id="itemName" v-model="newItemName" required>
            <button type="submit">Add Item</button>
        </form>
    </div>
    <script>
        new Vue({
            el: '#app',
            data() {
                return {
                    items: [
                        { id: 1, name: "Item 1" },
                        { id: 2, name: "Item 2" },
                        { id: 3, name: "Item 3" },
                    ],
                    newItemName: "",

};
            },
            methods: {
                addItem() {
                    // Create a new item object with a unique ID
                    const newItem = {
                        id: Date.now(),
                        name: this.newItemName,
                    };

// Push the new item object into the items array
                    this.items.push(newItem);

// Clear the input field
                    this.newItemName = "";
                },
            },

});
    </script>
    <style scoped>
        table {
            border-collapse: collapse;
            width: 100%;
            max-width: 600px;
            margin: 0 auto;
        }

th,
        td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
        }

th {
            background-color: #f2f2f2;
        }

tr:nth-child(even) {
            background-color: #f2f2f2;
        }

tr:hover {
            background-color: #ddd;
        }

form {
            display: flex;
            align-items: center;
            margin-top: 16px;
        }

label {
            margin-right: 8px;
        }

input[type="text"] {
            flex: 1;
            border: 1px solid #ddd;
            padding: 8px;
            font-size: 16px;
            line-height: 1.5;
            border-radius: 4px;
        }

button[type="submit"] {
            background-color: #4CAF50;
            color: #fff;
            border: none;
            padding: 12px 16px;
            font-size: 16px;
            border-radius: 4px;
            cursor: pointer;
            margin-left: 8px;
        }

button[type="submit"]:hover {
            background-color: #3e8e41;
        }
    </style>
</body>
</html>