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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>replace function</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function styleHyphenFormat(propertyName) {
      return propertyName.replace(/[A-Z]/g, function (match, offset) {
        return (offset > 0 ? "-" : "") + match.toLowerCase();
      });
    }
    document.getElementById("out").textContent = [
      styleHyphenFormat("borderTop"),
      styleHyphenFormat("backgroundColor")
    ].join("\n");
  </script>
</body>
</html>

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String.replace() — replacer function (Try It)