JSFiddle - React, Tailwind, and code Playground

HTML

<select class="easyui-combobox easyui-validatebox" name="tip" required="true">
    <option value="___">Please select an option</option>
    <option value="l1">l1</option>
    <option value="l2">l2</option>
</select>
<div id="1">first</div>
<div id="2">second</div>

JavaScript

function changeType() {
    if ($('[name="tip"]').val() == '___') {
        $('#1').fadeIn();
        $('#2').hide();
    } else {
        $('#2').fadeIn();
        $('#1').hide();
    }
}

changeType();
    $('select[name="tip"]').on('change', function() {
        changeType();
    });