1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta charset="utf-8">
5 <title>计算器</title>
6 <script>
7 function cal(num1,num2,sign){
8 num1=Number(num1);
9 num2=Number(num2);
10 var s;
11 switch(sign){
12 case "+":
13 s=num1+num2;
14 break;
15 case "-":
16 s=num1-num2;
17 break;
18 case "*":
19 s=num1*num2;
20 break;
21 case "/":
22 if(num2){
23 s=num1/num2;
24 }else{s="error";}
25 break;
26 case "%":
27 if(num2){
28 s=num1%num2;
29 }else{s="error"}
30 break;
31 }
32 return (s);
33 }
34 var n1,n2,sig;
35 do{
36 n1=prompt("请输入第一个数");
37 var flag=(!isNaN(n1))?0:1;
38 }while(flag)
39 do{
40 n2=prompt("请输入第一个数(除数和被取余数不能为0！)");
41 var flag=(!isNaN(n2))?0:1;
42 }while(flag)
43 do{
44 sig=prompt("请输入第一个数");
45 var flag=(sig=="+" || sig=="-" || sig=="*" || sig=="/" || sig=="%")?0:1;
46 }while(flag)
47 document.write(n1+sig+n2+"="+cal(n1,n2,sig));
48 </script>
49 </head>
50 <body>
51
52 </body>
53 </html>
时间： 2024-09-17 08:30:21