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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <style>
    .scrolldiv {
      width: 500px;
      height: 400px;
      margin: 10px auto;
      background-color: #FF0000;
      overflow-y: scroll;
      padding: 10px;
    }
  </style>
</head>
<body>
  <div class="scrolldiv" id="testDiv">
    <br><br><br><br><br><br><br><br><br><br><br>
    <br><br><br><br><br><br><br><br><br><br><br>
    <br><br><br><br><br><br><br><br><br><br><br>
    <br><br><br><br><br><br><br><br><br><br><br>
    <br><br><br><br><br><br><br><br><br><br><br>
    <br><br><br><br><br><br><br><br><br><br><br>
  </div>
  
  <script>
    
    var divscroll = document.getElementById('testDiv');
    function divScroll() {
      var wholeHeight = divscroll.scrollHeight;
      var scrollTop = divscroll.scrollTop;
      var divHeight = divscroll.clientHeight;
      
      if(scrollTop+divHeight>=wholeHeight) {
        alert('div滚动到底部了');
      }
      if(scrollTop == 0) {
        alert('滚动到头部了');
      }
    }
    
    divscroll.onscroll = divScroll;
  </script>
</body>
</html>
Output 300px

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anonymouspro
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