JSFiddle - React, Tailwind, and code Playground

HTML

<div class="form-group">
   <select class="ui fluid search dropdown" id="Severidade" multiple="" name="Severidade"  onchange="Filtro()" style="width: 100%"><option value="">Severidade</option>
      <option>MEDIA</option>
      <option>ALTA</option>
      <option>BAIXA</option>
      <option>CRITICA</option>
   </select>
</div>

JavaScript

$("#Severidade").blur(function(){
var array=new array();
array.push("a","b","c");
    alert("OK");
});