苹果去掉alert网址

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);
                    }