W3School TIY Editor
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暗黑模式
运行代码
<!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"; text1 += text2 document.getElementById("demo").innerHTML = text1; } </script> </body> </html>