Defining methods in the component. What is the difference?

Question

JavaScript

Is there any difference between these three options?

Option 1

export default {
        methods: {
            test: () => {
                alert(1);
            }
        },
        mounted() {
            this.test();
        }
    }

Option 2

export default {
        methods: {
            test() {
                alert(1);
            }
        },
        mounted() {
            this.test();
        }
    }

Option 3

export default {
        methods: {
            test: function () {
                alert(1);
            }
        },
        mounted() {
            this.test();
        }
    }

Answer 1

In the first case, the context will not be an instance of the bean, so if you want to call other methods or access properties inside the method, this option is not acceptable.
The second is a shorter notation of the third .