获取web界面的title
UILabel* titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 44)];
titleLabel.textAlignment = NSTextAlignmentCenter;
titleLabel.font = [UIFont systemFontOfSize:14];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.text = [_Webview stringByEvaluatingJavaScriptFromString:@"document.title"];
// 改变标题
self.navigationItem.titleView = titleLabel;
获取web界面的image
NSString *articleImageUrl = [_webView stringByEvaluatingJavaScriptFromString:@"document.images[0].src"];
NSLog(@"imageurl===%@",articleImageUrl);
