<HTML>
<HEAD>
<meta charset="utf-8">
<STYLE>
.KALK{MARGIN:0 40%;}
.KALK .BUTT{MARGIN:2PX;WIDTH:48PX;HEIGHT:25PX;FONT-WEIGHT:BOLD;}
</STYLE>
</HEAD>
<BODY>
<FORM NAME="KAL" class="KALK">
<TABLE BORDER=1; WIDTH=230; HEIGHT=150; STYLE="BACKGROUND:#999;">
<TR>
<TD HEIGHT=30; STYLE="BACKGROUND:#555;">
<INPUT TYPE="text" NAME="Input" Size="23"> <SPAN STYLE="COLOR:#FFF"> <I>KARJO</I></SPAN>
<br>
</TD>
</TR>
<TR>
<TD>
<INPUT CLASS="BUTT" TYPE="button" NAME="seven" VALUE=" 7 " OnClick="KAL.Input.value += '7'">
<INPUT CLASS="BUTT" TYPE="button" NAME="eight" VALUE=" 8 " OnCLick="KAL.Input.value += '8'">
<INPUT CLASS="BUTT" TYPE="button" NAME="nine" VALUE=" 9 " OnClick="KAL.Input.value += '9'">
<INPUT CLASS="BUTT" TYPE="button" NAME="plus" VALUE=" + " OnClick="KAL.Input.value += ' + '">
<br>
<INPUT CLASS="BUTT" TYPE="button" NAME="four" VALUE=" 4 " OnClick="KAL.Input.value += '4'">
<INPUT CLASS="BUTT" TYPE="button" NAME="five" VALUE=" 5 " OnCLick="KAL.Input.value += '5'">
<INPUT CLASS="BUTT" TYPE="button" NAME="six" VALUE=" 6 " OnClick="KAL.Input.value += '6'">
<INPUT CLASS="BUTT" TYPE="button" NAME="minus" VALUE=" - " OnClick="KAL.Input.value += ' - '">
<br>
<INPUT CLASS="BUTT" TYPE="button" NAME="one" VALUE=" 1 " OnClick="KAL.Input.value += '1'">
<INPUT CLASS="BUTT" TYPE="button" NAME="two" VALUE=" 2 " OnCLick="KAL.Input.value += '2'">
<INPUT CLASS="BUTT" TYPE="button" NAME="three" VALUE=" 3 " OnClick="KAL.Input.value += '3'">
<INPUT CLASS="BUTT" TYPE="button" NAME="times" VALUE=" x " OnClick="KAL.Input.value += ' * '">
<br>
<INPUT CLASS="BUTT" TYPE="button" NAME="clear" VALUE=" C " OnClick="KAL.Input.value = ''">
<INPUT CLASS="BUTT" TYPE="button" NAME="zero" VALUE=" 0 " OnClick="KAL.Input.value += '0'">
<INPUT CLASS="BUTT" TYPE="button" NAME="DoIt" VALUE=" = " OnClick="KAL.Input.value = eval(KAL.Input.value)">
<INPUT CLASS="BUTT" TYPE="button" NAME="div" VALUE=" / " OnClick="KAL.Input.value += ' / '">
<br>
</TD>
</TR>
</TABLE>
</FORM>
</BODY>
</HTML>
untuk contoh kasus, kalkulator luas segitiga
<html>
<head>
<title>Menghitung Luas Segitiga</title>
<script type="text/javascript">
function hitungLuas(){
alas=document.getElementById("txtAlas").value;
tinggi=document.getElementById("txtTinggi").value;
Luas=1/2*alas*tinggi;
document.getElementById("txtLuas").value = Luas;
}
</script>
</head>
<body>
Menghitung Luas Segitiga<br />
Alas : <input id="txtAlas" name="txtAlas" type="text" /><br />
Tinggi : <input id="txtTinggi" name="txtTinggi" type="text" /><br />
<input id="btnHitung" onclick="hitungLuas();" type="button" value="Hitung Luas" /><br />
Luas : <input id="txtLuas" name="txtLuas" type="text" />
<body>
<html></html></body></body></html><br />
<br />
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