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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>\s+</title>
</head>
<body>
  <h1>Whitespace cleanup</h1>
  <pre id="out"></pre>
  <script>
    var messy = "too    many   spaces";
    document.getElementById("out").textContent =
      "Before: " + messy + "\nAfter:  " + messy.replace(/\s+/g, " ");
  </script>
</body>
</html>

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JavaScript RegExp + quantifier — collapse whitespace (Try It)