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<!DOCTYPE html> <html> <style> #myDIV { border: 1px solid black; padding: 16px; } </style> <body> <h1>Element 对象</h1> <h2>getElementsByTagName() 方法</h2> <div id="myDIV"> <h3>A h3 element in div.</h3> <p>P element in div.</p> <span>A span element in div.</span> <h2>A h2 element in div.</h2> <div>A div element in div.</div> <p>Another p element in div.</p> </div> <p>单击下面的按钮可为 div 元素内的所有元素添加背景色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { const div = document.getElementById("myDIV"); const nodes = div.getElementsByTagName("*"); for (let i = 0; i < nodes.length; i++) { nodes[i].style.backgroundColor = "red"; } } </script> </body> </html>