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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 5px; } </style> </head> <body> <p>单击按钮为 div 的第二个子元素（索引 1）添加背景色。</p> <button onclick="myFunction()">试一试</button> <div id="myDIV"> <p>第一个 p 元素</p> <p>第二个 p 元素</p> </div> <script> function myFunction() { var c = document.getElementById("myDIV").children; c[1].style.backgroundColor = "yellow"; } </script> </body> </html>