RUNOOB.COM
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>电脑学习网教程(runoob.com)</title> </head> <body> <p>点击按钮在弹窗总使用换行。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction(){ alert("Hello\nHow are you?"); } </script> </body> </html>
运行结果