How to start in Javascript

JavaScript works with scripts within the HTML code. The opening tag tells the browser to wait for JavaScript code instead of HTML.

How to start in Javascript | Learn JavaScript | JavaScript works with scripts within the HTML code. The opening tag tells the browser to wait for JavaScript code instead of HTML

We will start by learning to place scripts within the HTML code, to insert comments in the scripts so that in the future it will be easier to understand and use the scripts to communicate with the user.

Tag Attribute Description

html

 

Contains the HTML part of the Web page

head

 

Contains the header part of the Web page

script

 

It contains the script of the Web page or a reference to the external file of the script; Normally Javascript, but not always.

 

language

Programming language for the script. This attribute has been deprecated in favor of type.

 

type

Programming language for the script. Requires attribute.

 

src

Location of an external script

title

 

Contains the title of the page

body

 

Contains the body part of the Web page

 

bgcolor

Set the background color of the page

h1...h6

 

The content of this tag is highlighted as header information, h1 is the largest header size, while h6 is the smallest header.

 

align

Describe the place on the page where the content of this label should be placed, in terms of horizontal or vertical alignment.

to

 

Links to another Web page

 

href

Specifies where the user will go when they click on the link.

 

Id

Identifier assigned to the link.

Where to place the scripts

Scripts can be placed in one of two possible sites on the HTML page: between the <head> and </head> tags (part called the script header), or between the <body> and </body> tags (or body of the script). The following script is an example of a script inserted into the body.

First script in JavaScript

There is an HTML containing tag, which designates the scripts, and which, as expected, starts with <script> and ends with </script>.
Para escribir su primer guión

  1. <script languahe="Javascript" type="text/javascript">

Here is a script opening tag. It tells the browser to wait for JavaScript instead of HTML. The language="Javascript" attribute tells the browser the script language that is being used, and the type="text/javascript" attribute tells it that the script is in text-only format, organized as JavaScript.

  1. document.write("¡Hello, World!");

This is your first javascript line, which takes command of the document window and writes "Hello, World!" in it, as shown in the following figure.

Script Hello World in JavaScript

Observe the semicolon at the end of the line; tells the browser's JavaScript interpreter that the line has finished.

  1. </script>

This ends the JavaScript script and tells the browser to wait to find HTML code again.

Tips
- It is not necessary to add the language or type attributes to the tag (</script>).
- The language attribute of the script tag is deprecated in XHTML, which means that the W3C, the normalization body responsible for XHTML, has marked this attribute as one of those that will not necessarily be supported in future versions of the standard.
- The use of a semicolon at the end of a line of JavaScript is optional, as long as there is a sentence per line. It is advisable to adopt the habit of including it in the code for the same reason.
You can have as many script tags on a page as you want (and, therefore, several scripts).

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Professor at the University of Guadalajara

Hugo Delgado Desarrollador y Diseñador Web en Puerto Vallarta

Professional in Web Development and SEO Positioning for more than 10 continuous years.
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