JavaScript_document.location-setInterval/3.html at master · katerina-n/JavaScript_document.location-setInterval · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>3</title>
</head>
<body>
<script>

var a=prompt("введите строку с действием");
if(a){
    if(a.indexOf('+')>-1){
    var mass=a.split("+");
    var answer=parseInt(mass[0])+parseInt(mass[1]);
    document.write(answer);
    }
   else {
        if (a.indexOf('-')>-1) {
            var mass=a.split("-");
           document.write( parseInt(mass[0])-parseInt(mass[1]));
           // document.write(answer);
        }
        else {
            if (a.indexOf('*')>-1) {
                var mass=a.split('*');
                var answer=parseInt(mass[0])*parseInt(mass[1]);
                document.write(answer);
            }
            else {
                if (a.indexOf('/')>-1) {
                    var mass=a.split('/');
                    if(mass[1]!=0) {
                        var answer = parseInt(mass[0]) / parseInt(mass[1]);
                        document.write(answer);
                    }
                    else{
                        document.write("Деление на 0!");
                    }
                }
            }
        }
    }
}
 </script>
</body>
</html>