计算器(一)

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脚本说明:
把如下代码加入<body><center><script language=javascript src="../js/shang.js"></script>
区域中
<script language="JavaScript">

</script>
<form name="calc">
<table border=1>
<td colspan=4><input type="text" name="expr" size=30 action="compute(this.form)"> <tr>
<td><input type="button" value="  7  " onClick="enter(this.form, seven)">
<td><input type="button" value="  8  " onClick="enter(this.form, eight)">
<td><input type="button" value="  9  " onClick="enter(this.form, nine)">
<td><input type="button" value="   /  " onClick="enter(this.form, divide)">
<tr><td><input type="button" value="  4  " onClick="enter(this.form, four)">
<td><input type="button" value="  5  " onClick="enter(this.form, five)">
<td><input type="button" value="  6  " onClick="enter(this.form, six)">
<td><input type="button" value="  *  " onClick="enter(this.form, multiply)">
<tr><td><input type="button" value="  1  " onClick="enter(this.form, one)">
<td><input type="button" value="  2  " onClick="enter(this.form, two)">
<td><input type="button" value="  3  " onClick="enter(this.form, three)">
<td><input type="button" value="   -  " onClick="enter(this.form, minus)">
<tr><td colspan=2><input type="button" value="       0       " onClick="enter(this.form, zero)">
<td><input type="button" value="   .  " onClick="enter(this.form, decimal)">
<td><input type="button" value="  +  " onClick="enter(this.form, plus)">
<tr><td colspan=2><input type="button" value="   =   " onClick="compute(this.form)">
<td colspan=2><input type="button" value="AC" size= 3 onClick="clear(this.form)"> </table>
</form>

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