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<!DOCTYPE html> <html> <body> <p>+ 运算符连接（添加）字符串。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var text1 = "Good "; var text2 = "Morning"; var text3 = text1 + text2; document.getElementById("demo").innerHTML = text3; } </script> </body> </html>