使用 execCommand(copy) 从 textarea 复制到剪贴板

Created: November-22, 2018

例：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <textarea id="content"></textarea>
    <input type="button" id="copyID" value="Copy" />
    <script type="text/javascript">
        var button = document.getElementById("copyID"),
            input = document.getElementById("content");

        button.addEventListener("click", function(event) {
            event.preventDefault();
            input.select();
            document.execCommand("copy");
        });
    </script>
</body>
</html>

document.execCommand("copy") 将当前选择复制到剪贴板