// dari https://codepen.io/PJCHENder/pen/jamJpj?editors=1010
      // masukan html ini 
      // <input type="hidden" id="idcopy" :value="copyval">
      // <button class="absolute cursor-pointer" style="right:10px;top:100px;" @click="copyvalue()">tes</button>

  copyValue () {
      let testingCodeToCopy = document.querySelector('#idcopy')
      testingCodeToCopy.setAttribute('type', 'text')
      testingCodeToCopy.select()

      try {
        var successful = document.execCommand('copy');
        var msg = successful ? 'successful' : 'unsuccessful';
        alert('Testing code was copied ' + msg);
      } catch (err) {
        alert('Oops, unable to copy');
      }

      /* unselect the range */
      testingCodeToCopy.setAttribute('type', 'hidden')
      window.getSelection().removeAllRanges()
    },