计算器(三)

脚本说明:
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>