How to determine if the input box cannot be spaces

This time I will bring you a method to determine that the input box cannot be a space. What are the precautions for themethod to determine that the input box cannot be a space? The following is a practical case, let's take a look.

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{ }

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