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JavaScript Output

bello profile image Bello Updated on ・2 min read


JavaScript can display data in different ways using:

  • console.log() Object
  • alert() Object
  • document.write() Object
  • elem.innerHTML Property - elem is an arbitrary name.

console.log()

As shown in the previous article, you can debug unexpected results from the browser in the console.

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Using log Object</title>
</head>

<body>

    <script>
        console.log('Hello World!')
    </script>
</body>

</html>
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alert method

The alert is a method on the browser window object - window.alert(...). It is used to display data on the Windows browser. It displays the result in a modal dialog box.

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>Using alert object</title>
</head>

<body>

    <script>
        alert('Hello World!')
    </script>
</body>

</html>
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image.png


write method

To test for unexpected results directly in the browser window, the command document.write() is used. It allows HTML elements within the method. For example document.write("<h1>Hello World</h1>").

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=, initial-scale=1.0" />
    <title>Using write object</title>
  </head>

  <body>
    <script>
      document.write("<h2>Hello World!</h2>");
    </script>
  </body>
</html>
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innerHTML property

To target specific elements based on their selector, the innerHTML property is used on selected elements.

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=, initial-scale=1.0" />
    <title>Using innerHTML</title>
</head>
<h2 id="demo"></h2>

<body>
    <script>
       let elem = document.querySelector("#demo");
           elem.innerHTML = "Hello World!";
    </script>
</body>

</html>
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Outside of the console, but in the window browser, you can prepend the window object to any function, variable, or property. For example, prepend the window object to the alert function or to the document property like window.alert('...'), window.document.write('...'), window.document.querySelector('#demo') = "...".


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