How to use javascript with ect template

[dangquan045]

ex:

<script>
  let color: 'red';
</script>

<div class="box <%- @color %>"></div>

<style rel="stylesheet">
  .box {
    width: 100px;
    height: 100px;
  }
  .red {
    background: red;
  }
</style>