Add IF...ELSE to the login button event callback function to determine not to display the prompt box

Question

If this code does not add IF...ELSE, it will judge that everything is normal, and the dialog box will pop up. If it is added, the dialog box will not pop up. What's going on?

PHP中文网 · Answer

Well, that’s it.

上善若水 · Answer

OK, solve it yourself. The reason is that there are no spaces before the comment in the else clause, or simply wrap the comment