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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> 输入你的名字： <input type="text" onfocus="myFunction(this)"> <p>当输入字段获得焦点时，会触发一个更改背景颜色的函数。</p> <script> function myFunction(x) { x.style.background = "yellow"; } </script> </body> </html>