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<!DOCTYPE html> <html> <body> <a name="html">HTML 教程</a><br> <a name="css">CSS 教程</a><br> <a name="xml">XML 教程</a><br> <p>单击该按钮可显示文档中锚点的数量。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.anchors.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>