JavaScript 複製文字

<a class="link" href="http://example.com" target="_blank">http://example.com</a>
<input type="button" name="btnCopy" value="複製">

<script type="text/javascript">
    $(function () {
        $("input[name=btnCopy]").click(function () {
            var node = document.querySelector('.link');
            var range = document.createRange();
            range.selectNode(node);
            window.getSelection().removeAllRanges();
            window.getSelection().addRange(range);
            try {
                var successful = document.execCommand('copy');
                if (successful) {
                    alert("複製成功");
                } else {
                    alert("複製失敗");
                }
            } catch (err) {
                alert("複製失敗!");
            }
            window.getSelection().removeAllRanges();
        });
    });
</script>

參考：

• http://zencode.in/17.%E7%BD%91%E9%A1%B5%E4%B8%8A%E7%9A%84%E5%A4%8D%E5%88%B6%E4%B8%8E%E5%89%AA%E5%88%87.html
  网页上的复制与剪切