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<!DOCTYPE html> <html> <body> <h1>JavaScript 字符串</h1> <h2>concat() 方法</h2> <p>concat() 方法连接两个或多个字符串。</p> <p>连接三个字符串，每个字符串之间有空格：</p> <p id="demo"></p> <script> let text1 = "Hello"; let text2 = "world!"; let text3 = "Have a nice day!"; let result = text1.concat(" ", text2, " ", text3); document.getElementById("demo").innerHTML = result; </script> </body> </html>