<html><head></head><body><div id="d">js控制字体大小</div><script> var kk=0;var bb=0;function sizeChange(){if(kk>80){kk=0;}else if(kk>40){bb=80-kk;}else bb=kk;kk++;document.getElementById("d").style.fontSize=bb;}setInterval("sizeChange()",80);</script></body></html>原文：http://www.cnblogs.com/ganbo/p/5237014.html