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<!DOCTYPE html> <html> <head> <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.4.1.min.js"></script> </head> <body> <h1>设置 HTML</h1> <div id="01"> <h2 >Hello World!</h2> </div> <div id="02"> <h2 >Hello Sweden!</h2> </div> <script> $(document).ready(function() { var content = $("#02").html(); $("#01").html(content); }); </script> </body> </html>