HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Mixed line endings</title>
</head>
<body>
  <h1>Cross-platform split</h1>
  <pre id="out"></pre>
  <script>
    var mixed = "a\r\nb\nc\rd";
    var lines = mixed.split(/\r\n|\r|\n/);
    var normalized = mixed.replace(/\r\n|\r/g, "\n");
    document.getElementById("out").textContent =
      JSON.stringify(lines) + "\n" +
      JSON.stringify(normalized);
  </script>
</body>
</html>

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JavaScript RegExp \n — mixed line endings (Try It)