js drop-down box initial item onchange does not trigger the solution

The drop-down box initial item onchange does not trigger the solution

<select name="zone_id" id="s_zone" onchange="getTeamList();">
    <option value="">全部</option>
</select>

 aa

<script type="text/javascript">
function getTeamList() {
    alert(1);
    //ajax get the dynamic data of the drop-down box
}
$('#s_zone').change();
</scirpt>