html运行实例（js_async_2）-搜寻教程库

代码示例：（标识：js_async_2）

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript async / await</h2>

<p id="demo"></p>

<script>
async function getFile() {
  let myPromise = new Promise(function(myResolve, myReject) {
    let req = new XMLHttpRequest();
    req.open('GET', "/demo/js/mycar.html");
    req.onload = function() {
      if (req.status == 200) {
        myResolve(req.response);
      } else {
        myResolve("File not Found");
      }
    };
    req.send();
  });
  document.getElementById("demo").innerHTML = await myPromise;
}

getFile();
</script>

</body>
</html>