jsp-如何将输入值分配给我以后要使用的另一个变量？

Question

the problem is

when I say:

alert(parseInt(document.frmFuture.txtDays.value) + 7);

(value is number that user input) it shows fine.

but when I say:

var tmp = document.frmFuture.txtDays.value;
alert(tmp + 7);

it gives me undefined.

Actually, I want to do some cals later using the input number. But it looks like impossible? how can i do that?

Answer 1

You forgot the parseInt .

var tmp = parseInt(document.frmFuture.txtDays.value);
alert(tmp + 7);

Now it should work.