HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByClassName multi</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} span{display:block;margin:0.25rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <span class="orange fruit">Orange Fruit</span>
  <span class="orange juice">Orange Juice</span>
  <span class="apple juice">Apple Juice</span>
  <span class="foo bar">Something Random</span>
  <button id="btn" type="button">Match orange juice</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var matches = document.getElementsByClassName("orange juice");
      var lines = ["getElementsByClassName('orange juice')"];
      for (var i = 0; i < matches.length; i++) {
        lines.push("  " + matches[i].textContent);
      }
      var qsa = document.querySelectorAll(".orange.juice");
      lines.push("", "querySelectorAll('.orange.juice')");
      for (var j = 0; j < qsa.length; j++) {
        lines.push("  " + qsa[j].textContent);
      }
      document.getElementById("out").textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Document.getElementsByClassName — multiple classes (Try It)