JavaScript Output

JavaScript can "display" data in different ways:

• Writing into an HTML element, using innerHTML.
• Writing into the HTML output using document.write().
• Writing into an alert box, using window.alert().
• Writing into the browser console, using console.log().

Using innerHTML

To access an HTML element, JavaScript can use the document.getElementById(id) method.

document.getElementById("demo").innerHTML = 5 + 6;

Using document.write()

For testing purposes, it is convenient to use document.write().

<button onclick="document.write(5 + 6)">Try it</button>

Using window.alert()

You can use an alert box to display data.

window.alert(5 + 6);

Using console.log()

For debugging purposes, you can call the console.log() method in the browser to display data.

console.log(5 + 6);