Numbers don't have quotes around them.Ī True/False value. To signify that the variable is a string, you should enclose it in quote marks.Ī number. Note that variables have different data types: VariableĪ sequence of text known as a string. You can retrieve the value by just calling the variable by name: myVariable Īfter giving a variable a value, you can later choose to change it: var myVariable = 'Bob' You can do both these operations on the same line if you wish: var myVariable = 'Bob' If you are getting problems in your code, check the casing!Īfter declaring a variable, you can give it a value: myVariable = 'Bob' Note: JavaScript is case sensitive - myVariable is a different variable to myvariable. To start, we'll show how to add some basic JavaScript to your page, creating a "hello world!" example ( the standard in basic programming examples). You may have to start small and keep working in small consistent steps. However, becoming comfortable with JavaScript is a little harder than becoming comfortable with HTML and CSS. The above section might sound really exciting, and so it should - JavaScript is one of the most lively web technologies, and as you start to get good at using it, your websites will enter a new dimension of power and creativity. You can learn all that in detail later on, in our JavaScript learning area, and in the rest of MDN.īelow we will introduce you some aspects of the core language, and you'll also play with a few browser API features too.
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