函数不会返回q -Javascript

Question

I have the following function:

  "use strict";
    $(document).ready(function(){
        $("#slider,input[type='range']").on("mousemove touchmove ",function(){
            $("#test").html($(this).val())
        });
    });

        function AddClass(){
            var q=0;
            var p=prompt("Enter the class(es) you want to add seperated by a ','");
            var to_be_added=[];
            to_be_added=p.split(",");
            for (var j=0;j<to_be_added.length;j++){
                if(to_be_added[j][0] === "."){
                    to_be_added[j]=to_be_added[j].slice(1);//check if the first character of each class inside an array contains "." and remove it
                }
            }
            for (var k=0;k<to_be_added.length;k++){
                $("#slider").addClass(to_be_added[k]);
                q++;
            }
            return "q";
        }
        function delclass(){
            var q=0;
            var p=prompt("Enter the class(es) you want to remove seperated by a ','");
            var to_be_added=[];
            to_be_added=p.split(",");
            for (var j=0;j<to_be_added.length;j++){
                if(to_be_added[j][0] === "."){
                    to_be_added[j]=to_be_added[j].slice(1);//check if the first character of each class inside an array contains "." and remove it
                }
            }
            for (var k=0;k<to_be_added.length;k++){
                $("#slider").removeClass(to_be_added[k]);
                q++;
            }
            return "Hello";

        }

html:

<button onclick="delclass()">Delete</button>

The problem is that after running the above code i don't get anything in the console.Not even undefined.Any ideas?Jquery is included and $("#slider") is correct. Update If call the function from the console i will get "Hello" in the console but when i use button to call that function i get nothing

Answer 1

when i use button to call that function i get nothing

This is to be expected. The console does not show the return value of every function that executes in your code. If you manually execute code in the console, the console will show you the result of that execution. That is different from having code execute in your page.

Returning a value from an event handler does nothing, and it certainly does not output anything to the console.

If you want to display a value in the console, use console.log :

console.log("Hello");