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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <div class="a">
    <ul class="b1">
      <li class="c">1</li>
      <li class="c">2</li>
      <li class="c">3</li>
      <li class="c">4</li>
      <li class="c">5</li>
    </ul>
    <ul class="b2">
      <li class="c">1</li>
      <li class="c">2</li>
      <li class="c">3</li>
      <li class="c">4</li>
      <li class="c">5</li>
    </ul>
  </div>
</body>
</html>
 
var c1 = document.querySelectorAll('.b1 .c');
var c2 = document.getElementsByClassName('c');
var c3 = document.getElementsByClassName('b2')[0].getElementsByClassName('c');
​
console.log(c1.length);
console.log(c2.length);
console.log(c3.length);
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anonymouspro
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