JavaScript 实现点击按钮复制文本到剪贴板

<div class="assistant-wechat">小助理微信号：qbxq01</div>
        <div class="copy-wechat" onclick="copyToClipboard('qbxq01')">复制微信号</div>

<script type="text/javascript">
    function copyToClipboard(text) {
        if (text.indexOf('-') !== -1) {
            let arr = text.split('-');
            text = arr[0] + arr[1];
        }
        var textArea = document.createElement("textarea");
        textArea.style.position = 'fixed';
        textArea.style.top = '0';
        textArea.style.left = '0';
        textArea.style.width = '2em';
        textArea.style.height = '2em';
        textArea.style.padding = '0';
        textArea.style.border = 'none';
        textArea.style.outline = 'none';
        textArea.style.boxShadow = 'none';
        textArea.style.background = 'transparent';
        textArea.value = text;
        document.body.appendChild(textArea);
        textArea.select();
        try {
            var successful = document.execCommand('copy');
            var msg = successful ? '<div>小助理微信号已复制</div><div>快去加好友邀你入群</div>' : '<div>该浏览器不支持点击复制到剪贴板</div>';
            showAlert(msg)
        } catch (err) {
            showAlert('<div>该浏览器不支持点击复制到剪贴板</div>');
        }
        document.body.removeChild(textArea);
    }
    // 自定义提示框
    function showAlert(str) {
        var alertPart = document.createElement('div');
        alertPart.className = "alert-part";
        alertPart.innerHTML = str;
        document.body.appendChild(alertPart);
        var timeout = setTimeout(function () {
            document.body.removeChild(alertPart);
            clearTimeout(timeout);
        }, 2000)
    }
</script>