在H5网站开发中经常会出现alert提示，IOS手机会显示出网址，以下的js代码可以解决这个问题

var wAlert = window.alert;   
window.alert = function (message) {   
   try {   
       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 iwindow = alertFrame.window;   
       if (iwindow == undefined) {   
           iwindow = alertFrame.contentWindow;   
       }   
       iwindow.alert(message);   
       iframe.parentNode.removeChild(iframe);   
   }   
   catch (exc) {   
       return wAlert(message);   
   }   
}   
var wConfirm = window.confirm;   
window.confirm = function (message) {   
   try {   
       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 iwindow = alertFrame.window;   
       if (iwindow == undefined) {   
           iwindow = alertFrame.contentWindow;   
       }   
       var result=iwindow.confirm(message);   
       iframe.parentNode.removeChild(iframe);   
       return result; 
   }   
   catch (exc) {   
       return wConfirm(message);   
   }   
}