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<!DOCTYPE html> <html> <body> <h1>JavaScript async / await</h1> <p>请等待 3 秒（3000 毫秒）让此页面发生变化。</p> <h1 id="demo"></h1> <script> async function myDisplay() { let myPromise = new Promise(function(myResolve, myReject) { setTimeout(function() { myResolve("I love You !!"); }, 3000); }); document.getElementById("demo").innerHTML = await myPromise; } myDisplay(); </script> </body> </html>