Скачать или смотреть 💻 CompTIA A+ Lab 22.3.7 — JavaScript Basics

💻 CompTIA A+ Lab 22.3.7 — JavaScript Basics
This lab introduces JavaScript as a client-side scripting language, often used in web browsers for interactive features. It demonstrates how to write, test, and run basic JavaScript code.
🧠 Key Concepts
JavaScript Overview:
Scripting language used in web development for dynamic content.
Runs primarily in web browsers, but also on servers (Node.js).
Can manipulate HTML elements, handle events, and perform calculations.
Common Uses:
Form validation
Dynamic content updates without refreshing pages
Interactive buttons, sliders, and animations
Basic Syntax:
Variables: let, const, var
Functions: function myFunction() { }
Events: onclick, onmouseover
Output: console.log() or document.write()
▶️ Step 1 — Open Lab Environment
Launch the CompTIA lab platform or code editor (e.g., Visual Studio Code, CodePen).
Open a new HTML file or JavaScript file.
▶️ Step 2 — Write Basic JavaScript
Example: Display a message in the console:
// Display a message in the console
console.log("Hello, CompTIA A+!");
Example: Alert box in browser:
alert("Welcome to your first JavaScript program!");
▶️ Step 3 — Interact with HTML Elements
Click the button to see dynamic content change.
▶️ Step 4 — Test and Debug
Open Developer Tools in browser (F12) → Console tab.
Observe console messages and errors.
Correct syntax errors and re-run scripts.
▶️ Step 5 — Experiment with Variables and Functions
let name = "Chris";
function greetUser(user) {
console.log("Hello, " + user + "!");
}
greetUser(name);
Learn function calls, variable scope, and string concatenation.
⚠️ Important Notes for CompTIA A+ Exam
Know basic JavaScript syntax and functions.
Understand DOM manipulation and event handling.
Console.log is key for debugging in browser labs.
JavaScript runs on client side, so changes appear in browser dynamically.
Lab exercises often focus on practical scripting and troubleshooting, not full web development.

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