js implementation to determine whether the input box cannot be a space or null value code

This article mainly shares with you the code to implement js to determine that the input box cannot be a space or null value. It has a good reference value and I hope it can help 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{
	}

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