10-Promise的异常穿透.html

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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    /*
    异常穿透是指  可以只在最后写一个catch  就可以捕获到所有的错误
    中间不用管
    */

    let p1 = new Promise((resolve, reject) => {
      setTimeout(() => {
        // resolve('OK')   //ok  222   333
        reject('no')  //no 错误  只执行最后一个catch
      }, 1000);
    })

    p1.then((value) => {
      console.log(value);
    }).then(() => {
      console.log(2222);
    }).then(() => {
      console.log(333);
    }).catch((err) => {
      console.log(err, '错误');
    })
  </script>
</body>

</html>