PHP developer integral1
After following, you can keep track of his dynamic information in a timely manner
From JavaScript
As soon as the web page is opened, the numbers 1-6 are required to pop up in sequence, and each time they pop up, the page displays a corresponding title line (that is, from h1-h6). Note that h1-h6 tags should not appear on the page, but should be written by js.
2018-04-091 answers
