JavaScript while mousedown

You have to invoke the mousedown activity in some reasonable interval. I’d do this:

var mousedownID = -1;  //Global ID of mouse down interval
function mousedown(event) {
  if(mousedownID==-1)  //Prevent multimple loops!
     mousedownID = setInterval(whilemousedown, 100 /*execute every 100ms*/);

function mouseup(event) {
   if(mousedownID!=-1) {  //Only stop if exists

function whilemousedown() {
   /*here put your code*/
//Assign events
document.addEventListener("mousedown", mousedown);
document.addEventListener("mouseup", mouseup);
//Also clear the interval when user leaves the window with mouse
document.addEventListener("mouseout", mouseup);

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