javascript - document.getElementById() vs $() -


संभव डुप्लिकेट:

मैं jQuery और जावास्क्रिप्ट सीख रहा हूं।

  • मुझे आश्चर्य है कि क्यों $ () फ़ंक्शन jQuery का document.getElementById () जावास्क्रिप्ट का कार्य।

  • क्या यह $ () ?

  • यदि नहीं, तो $ ()

    की भूमिका क्या है क्योंकि मुझे यह प्रश्न मिला क्योंकि $ ()।

    <बाहरी> कोड> $ चयनकर्ताओं, HTML स्ट्रिंग्स और नियमित जेएस ऑब्जेक्ट स्वीकार करता है getElementById केवल एक तत्व का id विशेषता स्वीकार करता है वे अलग-अलग चीज़ें करते हैं।

    आप एक DOM ऑब्जेक्ट प्रॉपर्टी एक्सेस करने का प्रयास कर रहे हैं, लेकिन एक jQuery ऑब्जेक्ट से। JQuery ऑब्जेक्ट्स को लपेटें, लेकिन वे उन्हें प्रतिस्थापित नहीं करते।

    DOM ऑब्जेक्ट तक पहुंचने के लिए, आप $ (...) [0] (या $ (...)। प्राप्त करें (0) ) और आपका कोड ठीक काम करना चाहिए: 

      $ (...) [0] .उटरहाइट

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