Vue copy click event

copyText(str){

                  const el = document.createElement('textarea');
                  el.value = str;
                  el.setAttribute('readonly', '');
                  el.style.position = 'absolute';
                  el.style.left = '-9999px';
                  document.body.appendChild(el);
                  el.select();
                  document.execCommand('copy');
                  document.body.removeChild(el);

                  alert('wechat id copied successfully')
             // navigator.clipboard.writeText(copyText);
             //    alert('wechat id copied successfully')
            },