<!DOCTYPE html>
<html><head> <title></title> <meta charset="utf-8" /></head><body> <script language="javascript" type="text/javascript"> function overto() { seeme.innerHTML=" are you look at me";}
function moveto() { seeme.innerHTML=" ";}
</script> <form name="form1" action="#"> <input type="button" name="button1" value="鼠标放上面有提示" οnmοuseοver="javascript:overto()" οnmοuseοut="javascript:moveto()" /> <font id="seeme"> </font> </form></body></html>