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<!DOCTYPE html> <html> <body> <h2>通过 Id 查找 HTML 元素</h2> <p id="intro">Hello World!</p> <p>此示例演示了 <b>getElementsById</b> 方法。</p> <p id="demo"></p> <script> var myElement = document.getElementById("intro"); document.getElementById("demo").innerHTML = "介绍段落的文字是" + myElement.innerHTML; </script> </body> </html>