W3School TIY Editor
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<!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>