How can I add a key/value pair to a JavaScript object? -

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यहाँ मेरा ऑब्जेक्ट शाब्दिक है: 

  var obj = {key1: value1, key2: मान 2};

मैं वस्तु को {key3: value3} कैसे जोड़ सकता हूं?

एक वस्तु में नया गुण जोड़ने के दो तरीके हैं: 

  var obj = {key1: value1, key2: value2 };

डॉट संकेतन का उपयोग: 

  obj.key3 = "value3";

स्क्वायर ब्रैकेट नोटेशन का उपयोग करना: 

  obj ["key3"] = "value3";

जब आप संपत्ति का नाम जानते हैं तो पहले प्रपत्र का उपयोग किया जाता है दूसरे फॉर्म का उपयोग तब किया जाता है जब संपत्ति का नाम गतिशील रूप से निर्धारित होता है इस उदाहरण की तरह: 

  var getProperty = function (propertyName) {वापस obj [propertyName]; }; getProperty ( "कुंजी 1"); getProperty ( "कुंजी 2"); getProperty ( "key3");

ए वास्तविक जावास्क्रिप्ट अार्या का उपयोग करके या तो बनाया जा सकता है:

अर्रे आभासी संकेतन: 

  var arr = [];

अर्रे निर्माता का संकेतन: 

  var arr = नया सरणी ();

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