■スクリプト
<HTML>
<HEAD>
<TITLE>Sample</TITLE>
</HEAD>
<BODY bgColor="white">
<CENTER>
<H1>XY座標から角度を求めます</H1>
</CENTER>
<TABLE BORDER="1">
<SCRIPT Language="JavaScript">
<!--
alert("Math.atan2(12,24) = ",Math.atan2(12,24));
alert("Math.atan2(30,30) = ",Math.atan2(30,30));
// -->
</SCRIPT>
</TABLE>
</BODY></HTML>