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This article mainly introduces how to use JavaScript, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

JavaScript usage

The script in HTML must be between the and tag.

Scripts can be placed in the and sections of the HTML page.

JavaScript is the default scripting language in all modern browsers as well as in HTML5.

Label

To insert JavaScript in a HTML page, use a tag.

And will tell JavaScript where to start and end.

The line of code between and contains JavaScript:

Alert ("My First JavaScript")

Tip: the browser interprets and executes the JavaScript between and.

Tip: there will be type= "text/javascript" in the tag in the old instance, but now it is no longer needed.

JavaScript in

[xss_clean] ("This is a heading"); [xss_clean] ("

This is a paragraph

")

Tip: in this case, JavaScript writes text to HTML when the page loads.

JavaScript functions and events

The JavaScript statement in the above example is executed when the page is loaded.

Typically, we need to execute code when an event occurs, such as when the user clicks a button.

If we put the JavaScript code into the function, we can call the function when the event occurs.

JavaScript in or

You can put an unlimited number of scripts in the HTML document.

The script can be in or part of a HTML, or in both parts.

The usual practice is to put the function in the section, or at the bottom of the page. This allows you to put them in the same place without interfering with the content of the page.

JavaScript function in

Function myFunction () {document.getElementById ("demo") [xss_clean] = "My First JavaScript Function";} My Web PageA Paragraph

Try itfunction myFunction () {document.getElementById ("demo") [xss_clean] = "My First JavaScript Function";}

Tip: in this case, this function is called when the button is clicked.

Tip: put JavaScript at the bottom of the page code to make sure that in the

The script is executed after the element is created.

External JavaScript

You can also save the script to an external file. External files usually contain code used by multiple web pages.

The file extension of the external JavaScript file is .js. External scripts cannot contain tags.

To use an external file, set the .js file in the src attribute of the tag.

It is possible to reference script files in or. The actual running effect is exactly the same as the script you wrote in the tag.

Example

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