<html><body><h2>JavaScript 正则表达式</h2><p>将以下段落中的“microsoft”替换为“BEGTUT”：</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,"BEGTUT"); document.getElementById("demo").innerHTML = txt;}</script></body></html>