How to use js to determine that the input box cannot be a space or null value?

Below I will share with you a js implementation method for judging that the input box cannot be a space or a null value. It has a good reference value and I hope it will be helpful to everyone.

The example is as follows:

var sno = $('#sno').val(); var sname = $('#sname').val(); if((sno.indexOf(" ") >= 0 || sno == null) || (sname.indexOf(" ") >= 0 || sname == null)){ alert('学号和名称不能为空格或null值'); return; }else{ }

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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