HTML：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <link type="text/css" href="09.css" rel="stylesheet"/> <script type="text/javascript" src="jquery.js"></script> <title></title> </head> <body> <h1>wo men</h1> <p>cfjdsmc edvc ewrd csd wrvc d 2e34efrew8r934efc cred ewfced vefwid cfer fd 3ew fcxdwdkjfdke fewf dewkdse fcedwfewdfcs fre dfc ed fcejfoklew ferf defedefcd</p> <input type="button" id="big" value="放大"/><br /> <input type="button" id="small" value="缩小"/> <script type="text/javascript"> $("input").click(function(){ var t = $("p").css("font-size") var t1 = parseInt(t, 10) var unit = t.slice(-2) var name1 = $(this).attr("id") if(name1 == "big"){ t1 += 2 } else if(name1 == "small"){ t1 -= 2 } $("p").css("font-size", t1+unit) }) </script> </body> </html>
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原文：http://www.cnblogs.com/sunshine-blog/p/7124097.html