How to use JavaScript in browser

How to use JavaScript in the browser?

With the popularity of the Internet, people are increasingly relying on browsers as the portal to the Internet. At the same time, JavaScript, as a client-side scripting language, is playing an increasingly important role in browsers. In this article, we will explore how to use JavaScript in the browser.

1. Writing JavaScript code

JavaScript can be integrated in HTML or written as an external file, and can be introduced into HTML documents through the <script> tag. Let's look at a simple JavaScript example: </script>

var myName = "Lucy";
console.log("Hello " + myName);

The meaning of the code is to declare a variable named myName, the type is string, and assign it the value "Lucy". Then use the console.log() function to output Hello Lucy to the browser console. As you can see, JavaScript code is similar to other programming languages, including variables, functions, and control statements.

2. Execute JavaScript code

You can execute JavaScript code in two ways: one way is to enter the JavaScript code in the browser console, the other way is to embed the JavaScript code into the HTML document.

1. Enter JavaScript code in the browser console

First, open any website, press the F12 key, and select Control in the browser's developer tools Desk tab. In the console, you can directly enter JavaScript code and press the Enter key to execute the code.

After executing the above code, the console will output Hello Lucy.

2. Embed JavaScript code into HTML documents

You can use the