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<!DOCTYPE html> <html> <body> <h1>JavaScript Promise Object</h1> <h2>The then() Method</h2> <p id="demo"></p> <script> function myDisplayer(some) { document.getElementById("demo").innerHTML = some; } let myPromise = new Promise(function(myResolve, myReject) { let req = new XMLHttpRequest(); req.open('GET', "mycar.html"); req.onload = function() { if (req.status == 200) { myResolve(req.response); } else { myReject("File not Found"); } }; req.send(); }); myPromise.then( function(value) {myDisplayer(value);}, function(error) {myDisplayer(error);} ); </script> </body> </html>