$('#btn').click(function(e){
    let url = e.currentTarget.dataset.url;
    $("body").after("<textarea cols='1' rows='1' id='copyContent'>" + url + "</textarea>");
    let link = document.getElementById("copyContent");
    link.select(); // 选择对象 
    document.execCommand("Copy");
    $("#copyContent").remove();
    alert('复制成功');
})