• HTML = robot ka body (haath, pair, structure)
• CSS = rang-roop (paint, clothes)
• JavaScript = dimaag + buttons dabane par reaction
Jab aap kisi button pe click karte ho aur kuch change hota hai — wahi JS ka kaam hai.
Full form: JavaScript (log short me JS kehte hain).
Ye programming language hai — isme conditions, loops, functions sab hote hain.
2. Browser me JS kaise chalti hai?
Aapke phone/laptop ka browser (Chrome, Firefox…) ke andar ek JS engine hota hai.
1. HTML page load hoti hai
2. Agar page me <script> tag hai, engine us code ko padhta hai
3. Code chalata hai — text badal sakta hai, alert dikha sakta hai, calculation kar sakta hai
Aapko abhi koi software install karne ki zaroorat nahi. Browser hi kaafi hai.
3. console.log — aapka pehla dost
console.log(...) screen pe badi baat nahi likhta. Ye Developer Console me message bhejta hai — jaise notebook me note.
Seekhne ke time ye sabse useful cheez hai: “kya value aa rahi hai?” check karne ke liye.
Practice 1 — console.log
Neeche code me console.log hai. Run Code dabao, phir output box me message dekho.
Practice 2 — alert
alert browser me popup dikhata hai. Run karke dekho.