Web Front end Question collection (i)

1. What is the difference between margin and padding in CSS?
2. How does JavaScript detect if a variable is a string type? Please write out the function implementation.
3. The implementation of a Web page to calculate how much time left in the countdown program, the Web page on the real-time dynamic display "xx years left xx days xx xx minutes xx seconds."
4. Introduces the CSS box model.
5. Know what CSS browser compatibility issues are and how to troubleshoot browser compatibility issues?
6. Ajax cross-domain workarounds?
7. What are the ways CSS is introduced? What is the difference between link and @import?
8. CSS layout: Both sides, left width adaptive, right width fixed 200px
9. Writes a prototype for the local array array, implementing the same element in the array (preserving only one) and returning the deleted array.
10. How to improve the performance of Web pages?
11. How to solve several IE6 bugs

Web Front end Question collection (i)