fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"> </script> <script> $(document).ready(function(){ $("input").focus(function(){ $("span").css("display","inline").fadeOut(2000); }); }); </script> <style> span { display:none; } </style> </head> <body> <input> <span>请输入你的电话号码?</span> <p>点击输入框获取焦点。</p> </body> </html>
运行结果