js method to detect that the input content is all spaces_javascript skills

JavaScript method to determine that the input content cannot be all spaces, to avoid that the content of the input box is all spaces:

Copy code The code is as follows:

<script><br> function checkBlankSpace(str){<br> while(str.lastIndexOf(" " )>=0){<br> str = str.replace(" ","");<br> }<br> if(str.length == 0){<br> alert("The input cannot be all Empty");<br> }<br> }<br> function test(){<br> var testStr = document.getElementById("test").value;<br> checkBlankSpace(testStr);<br> }<br> </script>