h5的复制功能

js+html5实现复制文字按钮

<div>
        <input type="text" name="guanfangaddress" id="guanfangaddress"/>
         <span id="copyBT" >复制</span>
</div>

<script type="text/javascript">
    function copyArticle(event) {
        const range = document.createRange();
        range.selectNode(document.getElementById('guanfangaddress'));
        const selection = window.getSelection();
        if(selection.rangeCount > 0) selection.removeAllRanges();
        selection.addRange(range);
        document.execCommand('copy');
        alert("复制成功！");
    }
    document.getElementById('copyBT').addEventListener('click', copyArticle, false);
</script>