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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> <h2>通过 Id 查找 HTML 元素</h2> <p id="id01">Hello World!</p> <p id="id02">Hello Sweden!</p> <p id="id03">Hello Japan!</p> <p id="demo"></p> <script> $(document).ready(function() { var myElements = $("#id01"); $("#demo").text("id01 段落的文本是：" + myElements[0].innerHTML); }); </script> </body> </html>