How to enable javascript-Front-end Q&A-php.cn

With the development of the Internet, front-end development has become a part that cannot be ignored. As a very useful programming language, JavaScript has also been widely used in front-end development. However, for people who are not familiar with JavaScript, how to enable JavaScript can be a difficult problem. Next, let us learn how to activate JavaScript.

First of all, we need to make it clear that JavaScript is a scripting language that runs in the browser. Therefore, we need to open a browser first, such as Chrome, Firefox, etc. Here we take Chrome as an example to illustrate how to enable JavaScript.

1. Start JavaScript in Chrome

Open the Chrome browser

First, we need to open the Chrome browser. Find the Chrome icon on your computer desktop or taskbar and click it to open the browser. If the Chrome browser is not installed on your computer, you can download and install it first, and then open it.

Open the developer tools

In the Chrome browser, we can enable JavaScript by opening the developer tools. After opening the Chrome browser, find the menu bar (usually in the upper right corner of the browser), click "More Tools", and then click the "Developer Tools" option, or directly press the F12 key to open the developer tools.

Enter the console panel

In the open developer tools panel, we can see that there are many tabs. Here we're going to go into the console panel. You can access the console panel by clicking the "Console" label on the tab or directly pressing the shortcut key "Ctrl Shift J".

Enter JavaScript code in the console

Now, we have entered the console panel. In the command line of the console, we can enter some JavaScript code to test its operation. For example, we can enter a simple JavaScript statement "alert("Hello, world!")" and then press the Enter key to execute it.

In the console, we can see that a message box pops up, which displays the content we entered "Hello, world!", indicating that JavaScript has been successfully started.

2. Use HTML files to run JavaScript

In addition to entering JavaScript code in the console to start it, we can also start JavaScript by writing HTML files. Next, let's take a look at how to use HTML files to run JavaScript.

Open a text editor

First, we need to open a text editor. It is recommended to use more common text editors, such as Notepad, Sublime Text, etc.

Writing HTML code

Next, we have to write HTML code in a text editor. HTML is a markup language used to describe web pages. We can create various elements of web pages by writing some tags. However, here we only need to know how to introduce JavaScript code into HTML.

There are two ways to introduce JavaScript code into HTML. One way is to embed it directly in the HTML file, and the other way is to use an external JS file to introduce it. Specifically, we can introduce JavaScript code in one of two ways.

(1) Use inline method

In the tag of the HTML file, use the