W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $(".btn1").click(function(){ alert($("div").scrollTop()+" px"); }); }); </script> </head> <body> <div style="border:1px solid black;width:200px;height:200px;overflow:auto"> This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. </div> <button class="btn1">获得 scrollbar top offset</button> <p>试着移动滚动条，然后再次点击按钮。</p> </body> </html>