UIWebView：我可以在任何网页中禁用 javascript alert() 吗？
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UIWebView: Can I disable the javascript alert() inside any web page?
提问by Hyman
I am using UIWebViewto load a URL.
我正在使用UIWebView加载 URL。
Inside the page of that URL, it uses alert("whatever msg")as JavaScript. My UIWebViewwill pop up a window and show that alert message.
在该 URL 的页面内，它alert("whatever msg")用作 JavaScript。我的UIWebView将弹出一个窗口并显示该警报消息。
Is there a way to disable this kind of popup window or JavaScript alert window?
有没有办法禁用这种弹出窗口或 JavaScript 警报窗口？
回答by pop850
Add this after your web view has loaded its content
在您的 Web 视图加载其内容后添加此内容
[MyWebView stringByEvaluatingJavaScriptFromString:@"window.alert=null;"];
回答by Vivin Paliath
You can bind window.alertto another function. So:
您可以绑定window.alert到另一个函数。所以：
window.alert = function() {
//does nothing so effectively "disables" alert
};
Make sure you do this before you call any alerts. The neat thing about this is you can customize the way you display messages to the user. So you could override window.alertto log to the console (for debugging purposes) or you can render it on the page (with a lightbox or something similar).
请确保在调用任何警报之前执行此操作。这样做的好处是您可以自定义向用户显示消息的方式。因此，您可以覆盖window.alert以登录到控制台（用于调试目的），或者您可以在页面上呈现它（使用灯箱或类似的东西）。
回答by Tai Le Anh
Since a UIWebViewtranslates all Javascript alerts into native UIAlertViewsit is fairly simple to block it on the native end. Looking into UIAlertView.hthere is only one public method for showing an alert which is conveniently called: - (void)show;.
由于 aUIWebView将所有 Javascript 警报转换为本机UIAlertViews，因此在本机端阻止它是相当简单的。查看UIAlertView.h只有一种公共方法来显示警报，方便地称为：- (void)show;。
@interface UIAlertView (Blocker)
@end
#import "UIAlertView+Blocker.h"
@implementation UIAlertView (Blocker)
- (void)show {
return;
}
@end
You can find the answer here: https://stackoverflow.com/a/21698251/2377378
你可以在这里找到答案：https: //stackoverflow.com/a/21698251/2377378
回答by michaelxing
let script = """
window.alert=window.confirm=window.prompt=function(n){},
[].slice.apply(document.querySelectorAll('iframe')).forEach(function(n){if(n.contentWindow != window){n.contentWindow.alert=n.contentWindow.confirm=n.contentWindow.prompt=function(n){}}})
"""
webView.evaluateJavaScript(script, completionHandler: nil)
