清除ios系统alert弹出框的域名

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