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<!DOCTYPE html> <html> <body> <p>单击按钮将以下段落中的“Microsoft”替换为“BEGTUT”：</p> <p id="demo">Visit Microsoft!</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var str = document.getElementById("demo").innerHTML; var res = str.replace("Microsoft", "BEGTUT"); document.getElementById("demo").innerHTML = res; } </script> </body> </html>