<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
var a=
parseInt(
prompt(
'请输入第一个数'));
var b=
prompt(
'请输入运算符');
var c=
parseInt(
prompt(
'请输入第二个数'));
var sum =
0;
switch (
b){
case '+':
sum=
a+
b;
break;
case '-':
sum=
a-
b;
break;
case '*':
sum=
a*
b;
break;
default :
sum=
0;
}
</script>
</body>
</html>
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