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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $(".btn1").click(function(){ $("p").fadeOut(1000); }); $(".btn2").click(function(){ $("p").fadeIn(1000); }); }); </script> </head> <body> <button class="btn1">淡出</button> <button class="btn2">淡入</button> <p>这是一个段落。</p> </body> </html>