js实现复制功能兼容ios

html:

<div id="copyBT">这是要复制的1内容</div>

<a id="contentas">这是复制按钮</a>

js:

   function copyArticle() {

                const range = document.createRange();

                range.selectNode(document.getElementById('copyBT'));

                const selection = window.getSelection();

                if (selection.rangeCount > 0) selection.removeAllRanges();

                selection.addRange(range);

                document.execCommand('copy');

                alert("复制成功")

            }

            document.getElementById('contentas').addEventListener('click', copyArticle, false);