JSFiddle - React, Tailwind, and code Playground
HTML
<Select name=drop id=drop>
<option value=1>1</option>
<option value=2>2</option>
</select>
<input type=button name=test id=test value=test>
JavaScript
var myarray = [];
$("#test").click(function() {
myarray.push($("#drop").val());
alert(myarray);
});
console.log[myarray]