After clicking the "Add" button, the page just flashed, with no success prompt.

Question

After clicking the "Add" button, the page just flashed for a moment without a success prompt, even if I copied the teacher's code it didn't work either

Answer 1

The test should be submitted. When submitting, the page refreshes http://www.php.cn/php-notebook-163726.html. Click this article to modify

Answer 2

Take a look at the browser error report: