<!-- 把如下代码加入<body>区域中 -->
<FORM NAME="Calc">
<TABLE BORDER=4><TR><TD>
<INPUT TYPE="text"NAME="Input" Size="16"><br>
</TD></TR><TR><TD>
<!-- all the buttons go here, just add as many as you like! -->
<INPUT TYPE="button" NAME="one"VALUE="; 1; " OnClick="Calc.Input.value += '1'">
<INPUT TYPE="button" NAME="two"VALUE="; 2; " OnCLick="Calc.Input.value += '2'">
<INPUT TYPE="button" NAME="three" VALUE="; 3; " OnClick="Calc.Input.value += '3'">
<INPUT TYPE="button" NAME="plus"; VALUE="; +; " OnClick="Calc.Input.value += ' + '"><br>
<INPUT TYPE="button" NAME="four"; VALUE="; 4; " OnClick="Calc.Input.value += '4'">
<INPUT TYPE="button" NAME="five"; VALUE="; 5; " OnCLick="Calc.Input.value += '5'">
<INPUT TYPE="button" NAME="six"VALUE="; 6; " OnClick="Calc.Input.value += '6'">
<INPUT TYPE="button" NAME="minus" VALUE="; -" OnClick="Calc.Input.value += ' - '"><br>
<INPUT TYPE="button" NAME="seven" VALUE="; 7; " OnClick="Calc.Input.value += '7'">
<INPUT TYPE="button" NAME="eight" VALUE="; 8; " OnCLick="Calc.Input.value += '8'">
<INPUT TYPE="button" NAME="nine"; VALUE="; 9; " OnClick="Calc.Input.value += '9'">
<INPUT TYPE="button" NAME="times" VALUE="; x; " OnClick="Calc.Input.value += ' * '"><br>
<INPUT TYPE="button" NAME="clear" VALUE="; c; " OnClick="Calc.Input.value = ''">
<INPUT TYPE="button" NAME="zero"; VALUE="; 0; " OnClick="Calc.Input.value += '0'">
<INPUT TYPE="button" NAME="DoIt"; VALUE="; =; " OnClick="Calc.Input.value = eval(Calc.Input.value)">
<INPUT TYPE="button" NAME="div"VALUE="; /" OnClick="Calc.Input.value += ' / '"><br>
</TD></TR>
</TABLE>
</FORM>
