Javascript: bug in processing js global in Firefox 3.0

There are three code blocks below. from a theoretical point of view, after clicking this box, they should execute it ten times. A dialog box with 10 numbers will pop up.

There are three code blocks below. from a theoretical point of view, after clicking this box, they should all execute it ten times. A dialog box with 10 numbers will pop up, but the first code block, because it is global, will be executed only once under Firefox, that is, only one dialog box will pop up, after using onload and (fn) (); method, but it can be displayed normally, so I personally think this is a bug of Firefox. Through repeated tests, Google browser, Firefox, IE, Opera, and Safari appeared once, and other browsers appeared ten times.

According to the test result of Firefox 3.5B4 today, it is 10 times. It has been proved that this is a bug in Firefox 3.0 when processing js globally.

1