async&await 

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>async&await</title>
  </head>
  <body>
    <script>
      function getTime() {
        return new Promise((resolve, reject) => {
          setTimeout(function () {
            resolve(3);
          }, 1000);
        });
      }

      async function sum() {
        let time = await getTime().catch(err => console.log(err));
        console.log(time);
      }
      sum();
    </script>
  </body>
</html>

 

posted @ 2022-04-09 21:38  苹果π  阅读(15)  评论(0)  编辑  收藏  举报