[laimas]

<div id="dom">
    <select id="1">
        <option>1111</option>
        <option>2222</option>
    </select>
    <select id="2">
        <option>1111</option>
        <option>2222</option>
    </select>
    <select id="20">
        <option>1111</option>
        <option>2222</option>
    </select>
</div>

<script>
document.getElementById('dom').addEventListener("change", function(e) {
    alert(e.target.id)
});
</script>