js把文本复制到剪切版，实现一键复制内容功能

  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 ? '成功复制到剪贴板' : '该浏览器不支持点击复制到剪贴板';
            alert(msg);
        } catch (err) {
            alert('该浏览器不支持点击复制到剪贴板');
        }

        document.body.removeChild(textArea);
    }