原生confirm去除链接

window.confirm = function(text){
    var iframe = document.createElement("IFRAME");
    iframe.style.display="none";
    iframe.setAttribute("src", 'data:text/plain,');
    document.documentElement.appendChild(iframe);
    var result = window.frames[0].window.confirm(text);
    iframe.parentNode.removeChild(iframe);
    return result;
};