Javascript interview questions part 28
Javascript interview questions part 28
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Total Questions: 20
1. Which method is used to add a binding?
Correct Answer is : bind()
2. Which method is used to remove a binding?
Correct Answer is : unbind()
3. Which of the following are the parameters passed to the keymap after installation?
Correct Answer is : Keydown event’s object
4. What is the purpose of lazy loading?
Correct Answer is : Immediate loading is not necessary
5. Where is the external JavaScript placed in the case of lazy loading?
Correct Answer is : After window.onload event
6. What are the parameters of the attachEvent function?
Correct Answer is : Event, Function
7. What is the result when the showPerformanceMetrics() is called before loading the remote script?
Correct Answer is : Throws an error
8. Which of the following is an attribute to the script object?
Correct Answer is : onload
9. Which is the method used to add an event listener?
Correct Answer is : addEventListener()
10. What is the purpose of the domLoading attribute?
Correct Answer is : Document begins to load
11. How is the render time calculated?
Correct Answer is : Date.Now() – performance.timing.domLoading
12. The object whose properties are inherited by all instances of the class, and properties whose values are functions behaving like instance methods of the class, is _____________
Correct Answer is : Prototype object
13. You can refresh the webpage in JavaScript by using
Correct Answer is : location.reload
14. What is the initial step to set up a CSS Lazy Loading?
Correct Answer is : Fetching data
15. Consider the following code snippet : What is being done in the above code in JavaScript?
Correct Answer is : Event and EventListener is created according to the if-else
16. What is the purpose of holding whatever tag you create in the attribute type?
Correct Answer is : To identify the scripting language
17. What does the appendChild() method perform?
Correct Answer is : Appends a node as the last child
18. Consider the following code snippet : What is being done in the above function in JavaScript?
Correct Answer is : JS and CSS files are loaded
19. What should be the value of the type attribute of a variable if the type of file is CSS?
Correct Answer is : text/css
20. How to lazy load images?
Correct Answer is : Remove the src attribute
