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- <!DOCTYPE html>
- <html>
- <head>
- <script>
- function myFunction() {
- var a = parseInt(document.getElementById("valtozo_a").value),
- b = parseInt(document.getElementById("valtozo_b").value);
- if(!isNaN(a) || !isNaN(b)){
- document.getElementById("eredmeny_value").innerHTML = a + b;
- }else{
- document.getElementById("eredmeny_value").innerHTML = "hibás input";
- }
- }
- </script>
- </head>
- <body>
- <p><input id="valtozo_a" type="text"></p>
- <p><input id="valtozo_b" type="text"></p>
- <button type="button" onclick="myFunction()">Osszegezd!</button>
- <br>
- <p>Eredmeny: </p>
- <p id="eredmeny_value"></p>
- </body>
- </html>
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