Podcast
Questions and Answers
What is one of the primary uses of JavaScript?
What is one of the primary uses of JavaScript?
- Webpage interactivity and functionality (correct)
- Creating static websites
- Implementing database management systems
- Developing server-side applications
Where can JavaScript scripts be written in an HTML document?
Where can JavaScript scripts be written in an HTML document?
- Exclusively inside <footer> tags
- Within the <head> or <body> tag pairs (correct)
- Only in the footer
- In a separate configuration file
What is the file extension for external JavaScript files?
What is the file extension for external JavaScript files?
- .js (correct)
- .script
- .java
- .html
What does the SRC attribute do in the <script> tag?
What does the SRC attribute do in the <script> tag?
Which of the following describes a main advantage of using external JavaScript files?
Which of the following describes a main advantage of using external JavaScript files?
Which syntax is used for single-line comments in JavaScript?
Which syntax is used for single-line comments in JavaScript?
What is the effect of comments in JavaScript code?
What is the effect of comments in JavaScript code?
What is required to add JavaScript code directly within an HTML file?
What is required to add JavaScript code directly within an HTML file?
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Study Notes
Introduction to JavaScript
- JavaScript is among the most widely used programming languages.
- It enhances webpage functionality through interactivity, data processing, and enables development of applications like mobile apps, desktop apps, and games.
Adding JavaScript to a Web Page
-
Writing Scripts in the Heading
- JavaScript scripts are wrapped in
<script>tag pairs within HTML documents.
- JavaScript scripts are wrapped in
-
Writing Scripts in the Document Body
- JS scripts can also be placed within the body of the HTML document using the
<script>tag. - No functional difference exists between scripts in the heading or the body.
- JS scripts can also be placed within the body of the HTML document using the
-
The
<script>Tag- The
<script>tag is essential for incorporating JS scripts into HTML. - It can include attributes like
typeandlanguage, specifying the script type and programming language respectively.
- The
External JavaScript
- External JavaScript files use the
.jsextension. - These files can be referenced in HTML documents using the
SRCattribute of the<script>tag. - External JavaScript does not require the
<script>tag within the file; scripts are written like a regular text file.
Advantages of External Scripting
-
Code Separation
- Maintains a clear separation between HTML and JavaScript code.
-
Code Maintenance
- Enhances readability and maintainability by keeping JS in separate files.
-
Faster Page Loading
- Cached JavaScript files improve loading times for web pages.
Comments in JavaScript
- Comments in JavaScript are non-executable and do not affect the functionality of the webpage.
- They serve to describe and clarify what the code accomplishes.
- Single-line comments begin with double forward slashes
//, while multi-line comments are enclosed between/*and*/.
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