源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>享学课堂</title> </head> <body> <p>转换字符串为大写:</p> <button onclick="myFunction()">试试</button> <p id="demo">Hello World!</p> <script> function myFunction() { var text = document.getElementById("demo").innerHTML; document.getElementById("demo").innerHTML = text.toUpperCase(); } </script> </body> </html>
运行结果