jquery - Why use $ in the name of javascript variables? -

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संभावित डुप्लिकेट:

चर को आरंभ करने के इस दो तरीकों के बीच अंतर क्या है? 

  var $ val = 'कुछ' या var val = 'something'

जैसा कि मैंने देखा कि वे एक ही बात हैं।

शायद इस मामले में $ चर में नाम का ही हिस्सा है? (यह उस मामले में एक अर्थहीन प्रश्न बन जाएगा: /)

धन्यवाद

चर नाम में $ नाम का ही भाग है , लेकिन सम्मेलन इसका उपयोग चर नामों को शुरू करने के लिए करना है जब चर एक को दर्शाता है JQuery ऑब्जेक्ट। 

  var $ myHeaderDiv = $ ('# header'); Var myHeaderDiv = document.getElementById ('हेडर');

अब आपके कोड में, आप जानते हैं कि $ myHeaderDiv पहले से ही एक jQuery ऑब्जेक्ट है, इसलिए आप jQuery फ़ंक्शंस कॉल कर सकते हैं: 

 < कोड> $ myHeaderDiv.fade ();

DOM- चर से jQuery के चर में प्राप्त करने के लिए: 

  var $ myHeaderDiv = jQuery (myHeaderDiv); // एक और चर jQuery के लिए असाइन करें (myHeaderDiv)। Fade (); // सीधे // का उपयोग करें, जैसा कि $ को jQuery के ऑब्जेक्ट में रखा जाता है यदि आप अन्यथा निर्दिष्ट नहीं करते हैं: var $ myHeaderDiv = jQuery (myHeaderDiv); // असाइन करें $ (myHeaderDiv)। फ़ेड (); // उपयोग

jQuery चर से DOM- चर के लिए। 

  var myHeaderDiv = $ myHeaderDiv.get (0);

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