Web Front-end interview questions Collection (1)-margic

Web Front-end interview questions Collection (1)-margic

1. What is the difference between margin and padding in CSS?
2. In Javascript, how does one detect that a variable is of the String type? Write out the function implementation.
3. The webpage implements a countdown program to calculate the time remaining in the current year, requiring the webpage to dynamically display "xx years remaining xx days xx hours xx minutes xx seconds" in real time ".
4. This section describes the CSS box model.
5. All know the CSS browser compatibility issues and how to solve the browser compatibility problems?
6. What is the cross-origin Ajax solution?
7. What methods does CSS introduce? What is the difference between link and @ import?
8. CSS layout: Adaptive width on both sides, fixed width on the right 200px
9. Compile a prototype for the local Array to delete the Array with the same elements (only one) and return the deleted Array.
10. How to Improve webpage running performance?
11. Solutions for writing several IE6 bugs