Adding two big numbers in javascript : <p>I've been trying to add the following numbers using javascript;
<code>76561197960265728</code> + <code>912447736</code></p>

<p>Sadly, because of rounding in javascript it will not get the correct number, I need the number as a string.</p>

<p>I've tried removing the last few digits using substr and then adding the two numbers together and then putting the two strings together, sadly this doesn't work if the first of the number is a 1.</p>

<pre><code>function steamid(tradelink){
    var numbers = parseInt(tradelink.split('?partner=')[1].split('&amp;')[0]),
            base = '76561197960265728';

    var number = parseInt(base.substr(-(numbers.toString().length + 1))) + numbers;
            steamid = //put back together
}

steamid('https://steamcommunity.com/tradeoffer/new/?partner=912447736&amp;token=qJD0Oui2');
</code></pre>

<p>Expected:
<code>76561198872713464</code></p>
