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<!DOCTYPE html> <html> <body onclick="myFunction()"> <p>单击文档中的任意位置以显示活动元素。</p> <input type="text" value="一个输入框"> <button>一个按钮</button> <p id="demo"></p> <script> function myFunction() { var x = document.activeElement.tagName; document.getElementById("demo").innerHTML = x; } </script> </body> </html>