Custom JavaScript kya hai?

 

Custom JavaScript kya hai?

Custom JavaScript ka matlab hai aapke khud ke banaye huye JavaScript code jo kisi specific function, feature ya automation ko website ya app mein add karne ke liye likha gaya ho.

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✅ Simple Definition (Hinglish mein):

Custom JavaScript wo JavaScript code hota hai jo aap apne zarurat ke hisaab se manually likhte ho — jaise button click par alert, form validation, ya real-time calculator banana.

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🔹 Custom JavaScript ka Use Kahan Hota Hai?

Use Case	Example
🖱️ User Interaction	Button click karte hi message show ho
📊 Form Validation	Email valid hai ya nahi, check karna
🛍️ E-commerce	Live price calculator ya cart update
🕵️ SEO Tools (e.g. Screaming Frog)	Custom data extract karna
📦 CMS/Website	Extra animation ya functionality add karna

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🔹 Simple Example of Custom JavaScript:

html
<button onclick="sayHello()">Click Me</button>

<script>
  function sayHello() {
    alert("Namaste! Welcome to my website.");
  }
</script>

➡️ Jab user button par click karega, ek custom message pop-up hoga.

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🔹 Custom JavaScript in SEO Tools (like Screaming Frog):

• Screaming Frog mein aap Custom JavaScript likh kar:

  • Page ka content modify kar sakte ho

  • Specific HTML element ko track kar sakte ho

  • DOM se custom data extract kar sakte ho

🔸 Example:

javascript
return document.querySelector('meta[name="author"]').getAttribute('content');

Ye script har page se author meta tag ka content nikaal lega.

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🔹 Custom JavaScript ka Fayda:

Fayda	Kya karta hai?
🎯 Customized function banata hai	Apne need ke hisaab se kaam
🛠️ Website ko enhance karta hai	Interactivity aur automation
🔎 Data scraping mein use hota hai	Specific cheez extract karne ke liye
🌐 Browser-level kaam karta hai	Without server load

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🔹 Kahan Use Kiya Jata Hai?

• 💻 Websites

• 🛒 E-commerce Stores

• 📊 Analytics tools

• 🕷️ SEO spiders

• 🔄 Chrome extensions

• 🧪 Testing tools (e.g., Selenium)

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🔚 Ek Line Mein:

Custom JavaScript aapke web page ya tool mein wo function add karta hai jo default mein available nahi hota — aur aap usse apne hisaab se likhte ho.