// this is a comment

// You assign variables like this in JavaScript
// Instead of Dim a you'd write

var a

// as you can see, it's the same, just using the word 'var' instead of 'Dim'.
// But there's one other thing I have to add.

var a;

// The semicolon terminates the line. It's not always necessary, but it's
// good practice to use it.

// You assign a value like this

var a = "Hello, world";

// see?