JavaScript

Dear all

could anybody help me to code JS that:

when i mouseup cursor the ball shall not move follow the cursor.

When i mousedown and mousemove the ball shall follow the cursor.

here my code : https://jsfiddle.net/f56pvbua/

thanks alot

hello i copied a project in github have been trying to run it my local computer but its not working every time i run npm install i get this error
npm WARN hms@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
how do i solve this

<script src="/Scripts/jquery-1.10.2.js"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/tabulator/4.4.3/js/tabulator.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/tabulator/4.4.3/css/bootstrap/tabulator_bootstrap.min.css" rel="stylesheet" />
<link href="https://nightly.datatables.net/css/jquery.dataTables.css" rel="stylesheet" type="text/css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-confirm/3.3.2/jquery-confirm.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/1.10.16/js/jquery.dataTables.min.js"></script>
<script src="/Scripts/jquery.signalR-2.1.1.js"></script>

var settings = "blablah";

new Game(settings);

...

quitGame(settings) // ERROR: "Uncaught TypeError: quitGame is not a function at HTMLDocument.<anonymous>"

var Game = function(settings) {

... 

    function quitGame(settings) {

        ...
         
    }

}