By Jeffrey Sambells
Jeremy Keith's acclaimed publication, DOM Scripting (friends of ED: 1590595335, 2005), aiding you grasp the following point with numerous genuine global tutorials.
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The best solution is capability detection. Use capability detection Capability detection, often call object detection, refers to checking the existence of a script object or method before executing code, rather than relying on your knowledge of which browsers have which features. If the required object or method exists, the browser is capable of using it and will execute as expected regardless of the version or signature of the browser. ' ); } Now, when Bobby (who can throw a fastball) comes along, the code will still work, because you’re not checking for his name; you’re just checking if he can actually throw a fastball.
The hasOwnProperty() method returns true if the object has the property or method specified, but the check doesn’t include any properties or methods inherited from other objects. It only checks properties that were created directly on that particular object itself, such as the elements assigned to the array.