<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>计算器</title>
</head>
<!DOCTYPE html>
<html>
<head>
<meta charset="{CHARSET}">
<title>计算器</title>
</head>
<body>
<script>
var opStack = new Array(4);
opStack[0] = 0;
opStack[1] ='';
opStack[2] ='';
opStack[3] ='';
function StartCal(){
document.PAD.SUM.value="0";;
}
function KeyinNum(){
if(opStack[0] >=2){opStack[0] = 3;}
else {opStack[0] = 1;}
opStack[opStack[0]] =''+document.PAD.SUM.value;
}
function resetNum(){
opStack[0] = 0;
opStack[1] = 0;
document.PAD.SUM.value ='';
document.PAD.SUM.value ='0';
}
function calcl(x){
var opFlag =opStack[0];
if(opFlag == -1|| opFlag == 1){count(x);}
else if(opFlag == 3){
opStack[1] =''+eval(opStack[1] +opStack[2]+opStack[3]);
count(x);
}
}
function count(x){
if(x=='Si'){opStack[1] =''+Math.sin(opStack[1]);}
else if(x=='aS'){opStack[1]=''+Math.asin(opStack[1]);}
else if(x=='Co'){opStack[1]=''+Math.cos(opStack[1]);}
else if(x=='aC'){opStack[1]=''+Math.acos(opStack[1]);}
else if(x=='Ta'){opStack[1]=''+Math.tan(opStack[1]);}
else if(x=='aT'){opStack[1]=''+Math.atan(opStack[1]);}
else if(x=='≡'){opStack[1]=''+Math.pow(opStack[1],.5);}
else if(x=='^2'){opStack[1]=''+Math.pow(opStack[1],2);}
else if(x=='^3'){
opStack[1] =''+Math.pow(opStack[1],3);}
else if(x=='^4'){
opStack[1] =''+Math.pow(opStack[1],4);}
else if(x=='AB'){
opStack[1] =''+Math.abs(opStack[1]);}
else if(x=='~'){}
document.PAD.CAL.value='';
opStack[0] = -1
display()
document.PAD.SUM.focus();
document.PAD.SUM.select();
}
function display(){
var sum = parseFloat(opStack[1]);
document.PAD.SUM.value=''+Math.round(sum*Math.pow(10,14))/Math.pow(10,14);
}
function fra(){
var I;
var j = 1;
var k = document.PAD.SUM.value;
if(k >= 70){opStack[1] = 0;document.PAD.SUM.value ="---Error---";return;}
for(i = 1;i<=k;i++){j = j * I;}
opStack[1] = document.PAD.SUM.value = j;
document.PAD.SUM.focus();
document.PAD.SUM.select();
}
function entry(x){
if(opStack[0] == -1){opStack[0] = 1;opStack[1] ='';}
if(opStack[0] == 0){opStack[0] = 1;opStack[1] ='';}
if(opStack[0] == 2){opStack[0] = 3;opStack[3] ='';}
var result = result = opStack[opStack[0]];
if(result =='0'){result = '';}
if(x>='1'&&x<='9'){result = ''+ result + x;}
else if (x =='p'){result = ''+Math.PI;}
else if (x =='O'){if(result ! ='')result = '' + result +'0';}
else if (x =='B'){if(result ! ='')result = result.substring(0,result.length-1);}
else if (x =='.'){
if(result ! =''){if(result.indexOf(".") == -1)result +=".";}
else{result ='0.';}
}
if(result =='')result ='O';
opStack[opStack[0]] = result;
document.PAD.SUM.value =result;
}
function calc2(x) {
var opFlag = opStack[0];
if(opFlag ! = 2){
if(opFlag == 3){
opStack[1]=''+eval(opStack[1]+opStack[2]+opStack[3]);
display(); }
opStack[0] = 2;
opStack[2] = x;
document.PAD.CAL.value = x;
document.PAD,SUM.focuus();
document.PAD.SUM.select();
}
}
function neg(){
if(opStack[0] ! = 2 && opStack[0] ! = 0) {
opStack[0] = Math.abs(opStack[0]);
var result = opStack[opStack[0]];
if(result ! = '0' && result ! =''){
if(result.charAt(0) =='-'){result = result.substring(1,result.length);}
else{result ='-'+result;}
opStack[opStack[0]]= result;
document.PAD.SUM.value = result;
}
}
}
function TurnOff(){
var ask = confirm("您确定要关闭计算器么？");
if(ask == true){window.close();}
else{return;}
}
</script>
</body>
</html>
<body>
</body>
</html>
就是这段代码，照书上打出来还是不行
