To display a message or value in the browser console using JavaScript, you can use the console.log() function.
Here's an example:
console.log("Hello, World!");
This will output "Hello, World!" in the console. You can also output variables or other values:
let num = 10;
console.log(num);
This will output the value of the num variable in the console.
You can also display multiple values by separating them with commas:
let num1 = 5;
let num2 = 7;
console.log("The sum of", num1, "and", num2, "is", num1 + num2);
This will output "The sum of 5 and 7 is 12" in the console.