wkwebview 和 JS 自用

 -(void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation{
     //获取 当前页URL
     NSString *js = @"document.location.href";
     [self.webView evaluateJavaScript:js completionHandler:^(id _Nullable response, NSError * _Nullable error) {
         NSLog(@"response: %@", response);
     }];

 }

 //这个调用只能放在 finish 里，不然会报JS 异常
 - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
     NSString *js = @"headHide()";
     [self.webView evaluateJavaScript:js completionHandler:^(id _Nullable response, NSError * _Nullable error) {
         NSLog(@"\n error: %@", error);
     }];

 }