由于iOS的WkWebview对window.open方法进行了安全限制，即调用该方法，不会起到作用。
解放方法：当触发window.open方法时，会触发代理WKUIDelegate中的createWebViewWithConfiguration
- (nullable WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;
然后，我们就可以在这个方法中进行处理了。需要设置这个代理 webView.UIDelegate = self;
// 当调用window.open方法时，会掉用该代理方法
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures{
if (navigationAction.request.URL) {
NSURL *url = navigationAction.request.URL;
NSString *urlPath = url.absoluteString;
if ([urlPath rangeOfString:@"https://"].location != NSNotFound || [urlPath rangeOfString:@"http://"].location != NSNotFound) {
[[UIApplication sharedApplication] openURL:url];
}
}
return nil;
}
参考：http://stackoverflow.com/questions/30603671/open-a-wkwebview-target-blank-link-in-safa
