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<!DOCTYPE html> <html> <body> <a href="https://www.begtut.com/" tabindex="2">BEGTUT</a><br> <a href="http://www.google.com/" tabindex="1">Google</a><br> <a href="http://www.microsoft.com/" tabindex="3">Microsoft</a> <p>单击该按钮可获取文档中第一个链接（索引 0）的 Tab 键顺序。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("A")[0].tabIndex; document.getElementById("demo").innerHTML = x; } </script> </body> </html>