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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
/* jshint esnext: true */
​
new Promise((resolve, reject) => {
  setTimeout(resolve, 1000, "step1");
}).then(data => {
  console.log(data);
  return new Promise((resolve, reject) => {
    setTimeout(resolve, 1000, "step2");
  });
}).then(data => {
  console.log(data);
  return new Promise((resolve, reject) => {
    setTimeout(resolve, 1000, "step3");
  });
}).then(data => {
  console.log(data);
  return new Promise((resolve, reject) => {
    setTimeout(reject, 1000, "step4");
  });
}).catch(reason => {
  console.log(reason);
});
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anonymouspro
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