<html>
<head>
<title>Untitled</title>
<style type="text/css">
input[type=button]
{
width:25px;
height:25px;
}
</style>
<script type="text/javascript">
var result=0;
var point=false; // 判断是小数点前还是后
var multiple=0.1; // 初始化小数点后的倍率
var sort=0; // 标记加减乘除
var temp=0; // 记录上一轮结果
function onbutton0() // 数字按钮动作
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+0; // 小数点前的处理
else // 小数点后的处理
{
result=result+multiple*0;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton1()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+1;
else
{
result=result+multiple*1;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton2()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+2;
else
{
result=result+multiple*2;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton3()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+3;
else
{
result=result+multiple*3;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton4()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+4;
else
{
result=result+multiple*4;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton5()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+5;
else
{
result=result+multiple*5;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton6()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+6;
else
{
result=result+multiple*6;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton7()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+7;
else
{
result=result+multiple*7;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton8()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+8;
else
{
result=result+multiple*8;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton9()
{var name=document.getElementByIdx_x("show");
if(!point) result=10*result+9;
else
{
result=result+multiple*9;
multiple=multiple*0.1;
}
name.value=String(result);
}
function onbutton_point() // 小数点按钮
{var name=document.getElementByIdx_x("show");
point=true;
name.value=String(result)+".";
}
function onbutton_back() // 退格按钮
{var name=document.getElementByIdx_x("show");
var temp=name.value;
name.value="";
for(var i=0;i<temp.length-1;i++)
name.value+=temp[i];
}
function onbutton_plus()
{var name=document.getElementByIdx_x("show");
point=false;
multiple=0.1;
switch (sort) // 遇到下一个操作符时判断上一个操作符是什么，并进行上一个操作符的计算
{ //eg:1+2+3= 遇到第二个 + 时判断前一个符号，发现是 + 则进行 + 运算，得到 3 赋给 result
case 1:result=result+temp;
break;
case 2:result=temp-result;
break;
case 3:result=temp*result;
break;
case 4:result=temp/result;
break;
}
sort=1;
temp=result;
result=0;
name.value="0";
}
function onbutton_minus()
{var name=document.getElementByIdx_x("show");
point=false;
multiple=0.1;
switch (sort)
{
case 1:result=result+temp;
break;
case 2:result=temp-result;
break;
case 3:result=temp*result;
break;
case 4:result=temp/result;
break;
}
sort=2;
temp=result;
result=0;
name.value="0";
}
function onbutton_mult()
{var name=document.getElementByIdx_x("show");
point=false;
multiple=0.1;
switch (sort)
{
case 1:result=result+temp;
break;
case 2:result=temp-result;
break;
case 3:result=temp*result;
break;
case 4:result=temp/result;
break;
}
sort=3;
temp=result;
result=0;
name.value="0";
}
function onbutton_div()
{var name=document.getElementByIdx_x("show");
point=false;
multiple=0.1;
switch (sort)
{
case 1:result=result+temp;
break;
case 2:result=temp-result;
break;
case 3:result=temp*result;
break;
case 4:result=temp/result;
break;
}
sort=4;
temp=result;
result=0;
name.value="0";
}
function onbutton_equal()
{var name=document.getElementByIdx_x("show");
point=false; // 重置
multiple=0.1; // 重置
switch (sort)
{
case 1:result=result+temp;
break;
case 2:result=temp-result;
break;
case 3:result=temp*result;
break;
case 4:result=temp/result;
break;
}
sort=0; // 重置
temp=result;
result=0;
name.value=String(temp);
}
function onbutton_clear() // 重置为初始状态
{
result=0;
point=false;
multiple=0.1; // 初始化小数点后的倍率
sort=0; // 标记加减乘除
temp=0; // 记录上一轮结果
var name=document.getElementByIdx_x("show");
name.value="0";
}
</script>
</head>
<body>
<table align="center">
<tr>
<td colspan="5"><input type="text" value="0" id="show"></td>
</tr>
<tr>
<td><input type="button" value="7" onclick="onbutton7();"></td>
<td><input type="button" value="8" onclick="onbutton8();"></td>
<td><input type="button" value="9" onclick="onbutton9();"></td>
<td><input type="button" value="/" onclick="onbutton_div();"></td>
<td><input type="button" value="<" onclick="onbutton_back();"></td>
</tr>
<tr>
<td><input type="button" value="4" onclick="onbutton4();"></td>
<td><input type="button" value="5" onclick="onbutton5();"></td>
<td><input type="button" value="6" onclick="onbutton6();"></td>
<td><input type="button" value="*" onclick="onbutton_mult();"></td>
<td><input type="button" value="C" onclick="onbutton_clear();"></td>
</tr>
<tr>
<td><input type="button" value="1" onclick="onbutton1();"></td>
<td><input type="button" value="2" onclick="onbutton2();"></td>
<td><input type="button" value="3" onclick="onbutton3();"></td>
<td><input type="button" value="-" onclick="onbutton_minus();"></td>
<td rowspan="2"><input type="button" value="=" style="width:25px;height:57px;" onclick="onbutton_equal();"></td>
</tr>
<tr>
<td colspan="2"><input type="button" value="0" style="width:57px;height:25px;" onclick="onbutton0();"></td>
<td><input type="button" value="." onclick="onbutton_point();"></td>
<td><input type="button" value="+" onclick="onbutton_plus();"></td>
</tr>
</table>
</body>
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