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<!DOCTYPE html> <html> <body> <h2>JavaScript 字符串搜索</h2> <p>检查字符串是否包含 "world"：</p> <p id="demo"></p> <p>Internet Explorer 不支持 includes() 方法。</p> <script> let text = "Hello world, welcome to the universe."; document.getElementById("demo").innerHTML = text.includes("world"); </script> </body> </html>