<!DOCTYPE html>
function add(x1, x2) {
var form = document.getElementById("myForm");
form.submit();
x1 = parseFloat(form.x1.value);
x2 = parseFloat(form.x2.value);
result = x1 + x2;
alert('Wynik dodawania: ' + result.toFixed(2));
}
function sub(x1, x2) {
var form = document.getElementById("myForm");
form.submit();
x1 = parseFloat(form.x1.value);
x2 = parseFloat(form.x2.value);
result = x1 - x2;
alert('Wynik odejmowania: ' + result.toFixed(2));
}
<input size="20" name="x1">
<input size="20" name="x2">
<input type="button" value="Dodaj" onclick="add();">
<input type="button" value="Odejmij" onclick="sub();">
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}