<!DOCTYPE html> <html> <body> <h1>JavaScript 字符串</h1> <h2>toLocaleUpperCase() 方法</h2> <p>toLocaleUpperCase() 使用当前语言环境将字符串转换为大写字母:</p> <p id="demo"></p> <script> let text = "Hello World!"; let result = text.toLocaleUpperCase(); document.getElementById("demo").innerHTML = result; </script> </body> </html>