点击运行
<!DOCTYPE html> <html> <body> <h1>JavaScript 运算符</h1> <p>+ 运算符级联（相加）字符串。</p> <p id="demo"></p> <script> var txt1 = "What a very "; var txt2 = "nice day"; document.getElementById("demo").innerHTML = txt1 + txt2; </script> </body> </html>
运行结果
