📄 j12.html
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<HTML>
<SCRIPT LANGUAGE = "JavaScript">
function doCalc(x)
{
var a;
a = Math.PI * x * x;
alert ("半径为" + x + " " + "的圆的面积为" + " " + a);
document.all("calc").value=a;
}
</SCRIPT>
<BODY bgColor = white>
<FORM>
输入圆的半径：
<INPUT TYPE = TEXT size = 5 name = "rad">
圆的面积：
<INPUT TYPE = TEXT size = 5 name = "calc">
<BR><BR>
<INPUT type = button value = "显示面积" onclick="doCalc(rad.value)">
</FORM>
</BODY>
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