alert a variable value

A couple of things:

1. You can't use new as a variable name, it's a reserved word.
2. On input elements, you can just use the value property directly, you don't have to go through getAttribute. The attribute is "reflected" as a property.
3. Same for name.

So:

var inputs, input, newValue, i;

inputs = document.getElementsByTagName('input');
for (i=0; i<inputs.length; i++) {
    input = inputs[i];
    if (input.name == "ans") {   
        newValue = input.value;
        alert(newValue);
    }
}

Note, while the above answers are correct, if you want, you can do something like:

alert("The variable named x1 has value:  " + x1);

show alert box with use variable with message

<script>
$(document).ready(function() {
var total = 30 ;
alert("your total is :"+ total +"rs");
});
</script>