<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>