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<!DOCTYPE html> <html> <head> <style> input[type=text] { width: 100%; padding: 12px 20px; margin: 8px 0; box-sizing: border-box; border: 1px solid #555; outline: none; } input[type=text]:focus { background-color: lightblue; } </style> </head> <body> <p>在此示例中，我们使用 :focus 选择器在获得焦点（单击）时向文本字段添加背景色：</p> <form> <label for="fname">First Name</label> <input type="text" id="fname" name="fname" value="John"> <label for="lname">Last Name</label> <input type="text" id="lname" name="lname" value="Doe"> </form> </body> </html>