JSFiddle - React, Tailwind, and code Playground
HTML
<button onclick="playerOneCharge()">Stop</button>
JavaScript
var pOnePower=0;
var intVal=null;
function playerOneCharge(){
console.log(pOnePower);
if(!intVal){
intVal = setInterval(function(){ myTimer()}, 100);
}else{
clearInterval(intVal);
intVal=null;
}
}
function myTimer(){
++pOnePower;
console.log(pOnePower);
};
playerOneCharge();