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<!DOCTYPE html> <html> <body> <p>单击该按钮可将三个字符串合并为一个新字符串。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str1 = "Hello "; var str2 = "world!"; var str3 = "祝你今天过得愉快！"; var res = str1.concat(str2, str3); document.getElementById("demo").innerHTML = res; } </script> </body> </html>