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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <p>单击按钮将下面段落中的“blue”替换为“red”：</p> <p id="demo">Mr Blue has a blue house and a blue car.</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var str = document.getElementById("demo").innerHTML; var res = str.replace(/blue/g, "red"); document.getElementById("demo").innerHTML = res; } </script> </body> </html>