JavaScript does not validate that the input string is empty (contains spaces)

In the project, you need to verify that the input string is empty, including spaces, and do not like to use regular, so I think of JS's indexOf function, the IndexOf () method returns the position of a specified string value in the first occurrence of the string, and if the string value to retrieve does not appear, the method returns- 1.

Syntax: Stringobject.indexof (searchvalue,fromindex), Searchvalue required, Fromindex: Optional parameter, where to start retrieving in the string. Its legal value is 0 to stringobject.length-1. If this argument is omitted, it is retrieved from the first character of the string.

1 Demo:2 3 function CheckValue () {4 5             varEnumvalue = document.getElementById ('Txtenumvalue'). Value;6 7             if(Enumvalue.indexof (" ") >=0) {8 9Alert"content cannot contain spaces! ");Ten  One                 return false; A  -             } -  the             if(enumvalue=="") { -  -Alert"Please enter the content! "); -  +                 return false; -  +             } A  at}

JavaScript does not validate that the input string is empty (contains spaces)