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What is JavaScript?
What is JavaScript?
JavaScript is a powerful client-side scripting language used to enhance user interactions on webpages.
Which of the following can you do with JavaScript? (Select all that apply)
Which of the following can you do with JavaScript? (Select all that apply)
JavaScript is considered a loosely typed language.
JavaScript is considered a loosely typed language.
True
JavaScript values can be converted to ______ or ______.
JavaScript values can be converted to ______ or ______.
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What are the three ways to add JavaScript to a webpage?
What are the three ways to add JavaScript to a webpage?
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Client-side scripting languages are executed on the web server.
Client-side scripting languages are executed on the web server.
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How is a simple JavaScript variable defined?
How is a simple JavaScript variable defined?
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What is the significance of case sensitivity in JavaScript?
What is the significance of case sensitivity in JavaScript?
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Study Notes
What is JavaScript?
- JavaScript is a client-side scripting language used to enhance user interaction with web pages.
- It makes web pages more interactive and lively, with the use of animations, transitions, and user input responses.
- JavaScript is widely applied in game development and mobile application development.
What can you do with JavaScript?
- Modify web page content by adding or removing elements.
- Change the style and position of elements on a web page.
- Monitor events like mouse clicks and hovers, and respond to them.
- Perform and control transitions and animations.
- Create alert pop-ups to display information or warning messages.
- Perform operations based on user inputs and display results.
- Validate user input before submitting it to a server.
Why is JavaScript a loosely typed language?
- JavaScript is a loosely typed language, meaning variable types do not need to be specified before storing data.
- The type of a variable is determined automatically based on the type of information assigned to it.
- It allows flexibility and adaptability, requiring no explicit type declarations like 'int', 'float', 'boolean', or 'String'.
- This flexibility can lead to errors, but it also simplifies development for some users.
How is JavaScript added to Web Pages?
- JavaScript can be added to a web page in three ways:
- Embed the JavaScript code within
<script>and</script>tags. - Create an external JavaScript file with a '.js' extension and load it using the
srcattribute of the<script>tag. - Place JavaScript code directly within HTML tags using special event attributes like
onclick,onmouseover,onkeypress,onload, etc.
- Embed the JavaScript code within
Difference between Client-Side and Server-Side Scripting
- Client-side scripting languages (like JavaScript, VBScript) are interpreted and executed by the web browser on the user's computer.
- Server-side scripting languages (like PHP, ASP, Java, Python, Ruby) run on a web server, and their output is sent back to the browser in HTML format.
- Server-side scripts are slower than client-side scripts because they require communication with a remote server.
Understanding JavaScript Syntax
- JavaScript syntax defines the rules for structured JavaScript programs.
- JavaScript statements are placed within
<script>tags on a web page or in external '.js' files.
Case Sensitivity in JavaScript
- JavaScript is case-sensitive, meaning capitalization matters.
- Variable names, keywords, function names, and other identifiers must be consistently capitalized throughout the code.
JavaScript Variables
- Variables can be created using the
varkeyword.
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Description
Explore the fundamentals of JavaScript in this quiz. Understand its role as a client-side scripting language and discover how it enhances web interactivity. Test your knowledge on its applications in web development and game design.
