<!DOCTYPE html> <html> <body> <h1>JavaScript 字符串</h1> <h2>startsWith() 方法</h2> <p>如果字符串以指定字符串开头,startsWith() 返回 true:</p> <p id="demo"></p> <p>Internet Explorer 11(或更早版本)不支持 startsWith()。</p> <script> let text = "Hello world, welcome to the universe."; let result = text.startsWith("Hello"); document.getElementById("demo").innerHTML = result; </script> </body> </html>