原因：由于安全机制,WKWebView默认对JavaScript下alert(),confirm(),prompt()做了拦截，如果想正常使用，需要实现其三个代理方法。
1.设置代理
wkWebview.uiDelegate = self
2.解决alert方法
func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {
let vc = UIAlertController(title: "温馨提示", message: message, preferredStyle: .alert)
vc.addAction(UIAlertAction(title: "确定", style: .default) { ac in
completionHandler()
})
self.present(vc, animated: true, completion: nil)
}
3.解决confirm
func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (Bool) -> Void) {
let vc = UIAlertController(title: "温馨提示", message: message, preferredStyle: .alert)
vc.addAction(UIAlertAction(title: "确定", style: .default) { ac in
completionHandler(true)
})
vc.addAction(UIAlertAction(title: "取消", style: .cancel) { ac in
completionHandler(false)
})
self.present(vc, animated: true, completion: nil)
}
4.解决prompt
func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (String?) -> Void) {
let vc = UIAlertController(title: "温馨提示", message: prompt, preferredStyle: .alert)
vc.addTextField { tf in
tf.text = defaultText
}
vc.addAction(UIAlertAction(title: "确定", style: .default) { ac in
completionHandler(vc.textFields?[0].text)
})
vc.addAction(UIAlertAction(title: "取消", style: .cancel) { ac in
})
self.present(vc, animated: true, completion: nil)
}
