/Javascript/jQuery/I want to enable textbox when checkbox is checked in jquery or javascript

I want to enable textbox when checkbox is checked in jquery or javascript

function cash(cash) {
  if ($(cash).is(':checked')) {
    $('#cashAmount').attr("disabled", false);
  } else {
    alert("checkbox is not checked");
  }
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="col-md-12 field-option">
  <strong>Cash</strong> <input type="checkbox" name="cash" id="cash" onclick="cash(this)">
</div>
<div class="col-md-6 col-sm-6 custom_field">
  <!-- custom_field -->
  <span><strong>Amount <i>*</i></strong></span>
  <input type="text" name="cashAmount" id="cashAmount" class="form-control" disabled>
</div>

Source: stackoverflow.com

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