Cannot read property 'trim' of undefined

Question

login:52 Uncaught TypeError: Cannot read property 'trim' of undefined

at dologin (login:52)

at HTMLButtonElement.onclick (login:38)

How to solve this

Answer 1

$ = layui.jquery;

jquery is written wrong

I always write it wrong and I also write it wrong

Answer 2

Is this JS? There is no built-in trim method in the JS script, so an error is prompted. You need to write this class or function by hand.

Or you can refer to this article

js trim function to delete spaces at both ends