x
<html><body><h2>JavaScript Promise</h2><p id="demo"></p><script>function myDisplayer(some) { document.getElementById("demo").innerHTML = some;}let myPromise = new Promise(function(myResolve, myReject) { let x = 0;// some code (try to change x to 5) if (x == 0) { myResolve("OK"); } else { myReject("Error"); }});myPromise.then( function(value) {myDisplayer(value);}, function(error) {myDisplayer(error);});</script></body></html>