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<!DOCTYPE html> <html> <body> <h1>JavaScript 正则表达式</h1> <p>将“microsoft”替换为以下段落中的“W3School”：</p> <button onclick="myFunction()">试一试</button> <p id="demo">Please visit Microsoft and Microsoft!</p> <script> function myFunction() { var str = document.getElementById("demo").innerHTML; var txt = str.replace(/microsoft/i,"W3School"); document.getElementById("demo").innerHTML = txt; } </script> </body> </html>