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CSS :focus 伪类
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<!DOCTYPE html> <html> <head> <style> input:focus { background-color: yellow; } </style> </head> <body> <h1>Demo of :focus</h1> <p>Click inside (or tab to) the input fields to see a yellow background:</p> <form> <label for="name">Name: </label><br> <input id="name" name="name" type="text" /><br> <label for="email">Email: </label><br> <input id="email" name="email" type="email" /><br> <label for="country">Country: </label><br> <input id="country" name="country" type="text" /> </form> </body> </html>