JavaScript编写的简易计算器.doc
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!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN /TR/xhtml1/DTD/xhtml1-transitional.dtd
html xmlns=/1999/xhtml
head
meta http-equiv=Content-Type content=text/html; charset=utf-8 /
titleUntitled Document/title
/head
script language=javascript
var curState;
var curOper;
num1;
var preOper;
function setStartState()
{
curState=beStart;
num1=0;
curOper=start;
preOper=false;
}
function addNum(i)
{
if(preOper==true)
{
cal.total.value=i;
preOper=false;
}
else
{
if(cal.total.value==0)
{
cal.total.value=i;
curState=beInteger;
}
else
cal.total.value+=i;
}
}
function addPoint()
{
if(curState==beStart||curState==beInteger)
{
cal.total.value+=.;
curState=beFloat;//将当前状态设置为float
}
}
function cleartext()//清空计算结果文本框内容
{
cal.total.value=0;
curState=beStart;
curOper=start;
}
function count()//基本的加减乘除运算
{
if(curOper!=start)
{
switch(curOper)//根据curOper的值确定运算法则
{
case +:
num1=parseFloat(num1)+parseFloat(cal.total.value);break;
case -:
num1=parseFloat(num1)-parseFloat(cal.total.value);break;
case *:
num1=parseFloat(num1)*parseFloat(cal.total.value);break;
case /:
num1=parseFloat(num1)/parseFloat(cal.total.value);break;
}
cal.total.value=num1;
preOper=true;
}
preOper=start;
}
function setOper(oper)//当点击“+-*、”时，设置当前的运算法则
{
//alert(curOper);
preOper=true;//为布尔型，表示再次之前是否刚刚单击过双边运算法符
if(curOper==start)
{
//alert(curOper);
num1=0+cal.total.value;/*将第一个值用num1保存，采用‘0+’把total.value字符串转化为数值型，类似于使用parsefloat（）0方法*/
curOper=oper;
//alert(num1);
}
else
{
count();
curOper=oper;
}
//alert(curOper);
}
function useFunc(func)
{
switch(func)
{
case sin:
cal.total.value=Math.sin(cal.total.value);
preOper=true;
break;
case cos:
cal.total.value=Math.cos(cal.total.value);
preOper=true;
break;
case asin:
cal.total.value=Math.asin(cal.total.value);
preOper=true;
break;
case acos:
cal.total.value=Math.acos(cal.total.value);
preOper=true;
break;
case tan:
cal.total.va
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