JSFiddle - React, Tailwind, and code Playground

HTML

<form>
  <select id="select">
    <option disabled selected value="choose">
      CHOOSE
    </option>
    <option value="i2g" id="i2g">
      iPhone 2g
    </option>
    <option value="i3g" id="i3g">
      iPhone 3g
    </option>
  </select>
  <button onclick="func1()" type="button">
    GO
  </button>
</form>

<table id="iphone1g" border="1">
  <tr>
    <td id="itable1">
      1
    </td>
    <td id="itable2">
      2
    </td>
  </tr>
</table>

JavaScript

var m = document.getElementById("itable1");
var n = document.getElementById("itable2");

var select = document.getElementById("select");

function func1() {
  if (select.value == "i2g"){
    m.innerHTML = "hello";
  } 
  if (select.value == "i3g"){
    m.innerHTML = "adele";
  }
}