The console.warn() method is used to write a warning message in the console. So open the console to display the output (warning message).
Syntax:
console.warn( message )Parameters: This method accepts single parameter message which is mandatory. This parameter is used to hold the warning message.
Example 1: In this example, we display a warning message using console.warn(). It prompts users to press F12 to view the warning in the browser console. The content is centered and styled with green headers.
<!DOCTYPE html>
<html>
<head>
<title>console.warn() Method</title>
<style>
h1 {
color: green;
}
body {
text-align: center;
}
</style>
</head>
<body>
<h1>GeeksforGeeks</h1>
<h2>HTML console.warn() Method</h2>
<p>Press F12 to view the message</p>
<script>
console.warn
("This is a warning message for geeksforgeeks!");
</script>
</body>
</html>
Output:
Example 2: In this example we use console.warn() to log a warning message containing an array. Press F12 to view the warning in the browser’s console. The page is styled with center alignment.
<!DOCTYPE html>
<html>
<head>
<title>console.warn() Method</title>
<style>
h1 {
color: green;
}
body {
text-align: center;
}
</style>
</head>
<body>
<h1>GeeksforGeeks</h1>
<h2>HTML console.warn() Method</h2>
<p>Press F12 to view the message</p>
<script>
let Arr = ["Algorithm", "GeeksforGeeks", "Geeks"];
console.warn(Arr);
</script>
</body>
</html>
Output:
Supported Browsers: The browser supported by console.warn() method are listed below: