js 简单对a标签限制重复点击下载

     <a id="download_url" style="background: #66cc00" href="http://down.s" class="downl_b" onclick="return false;"> <span>急速下载</span> </a>
<script>
   $(function () {
        var isChick = true;
        $('#download_url').on('click', function () {
            setTimeout(function () {
                isChick = true;
            }, 9000);
            if (isChick) {
                isChick = false;
                window.location.href = $(this).attr('href');
            }
        })
    })
</script>