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JavaScript MCQs MCQs: 3100+ Questions & Answers in Programming

3100+ JavaScript MCQs MCQs in Programming with answers & explanations. Page 141. Practice objective questions for competitive exams, interviews & self-assess… Use the answer toggle below to show or hide all solutions, tap an option to check one question, or open a question for its own page.

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JavaScript MCQs MCQs: 3100+ Questions & Answers in Programming

What is the purpose of the event onAirEvent?

What is the purpose of the event disconnectionEvent?

When does one use the event ready?

When does one use the method startOverlays()?

What is the reason for avoiding the attributes property in the HTML DOM?

What are the two parts of JavaScript libraries?

Which of the following is added to prefs.js when the console is automatically opened during JavaScript error?

Which of the following is possible to be referenced in external JavaScript?

Which of the following attribute takes the source of the PHP file?

What kind of path can the PHP file be?

Which of the following global variables is used to get parameters?

What is the purpose of the RegExp method test()?

What is the purpose of the function parameter filetype?

Which of the following is the method used to add an element to the desired location?

Which program code doesn’t need preprocessing before being run?

Where are memory leaks found?

What is the central concept of JavaScript memory management?

When does a memory leak happen?

Which of the following functions are referenced internally?

What is the purpose of destroying the functions and objects?

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