W3School TIY Editor
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<!DOCTYPE html> <html> <body> <h1>设置 HTML</h1> <div id="01"> <h2>Hello China!</h2> </div> <div id="02"> <h2>Hello World!</h2> </div> <script> var content = document.getElementById("01").innerHTML; document.getElementById("02").innerHTML = content; </script> </body> </html>