OC代碼：

-(void)rightBarButtonItemPressed{
    NSString *js = @"document.getElementsByTagName('meta')['Description']['content']";
    UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"neisha_logo"]];
    imageView.hidden=YES;
    [self.view addSubview:imageView];
    UIImage *image=[[SDImageCache sharedImageCache] imageFromDiskCacheForKey:_imageUrl];
        [MBProgressHUD showHUDAddedTo:self.view animated:YES];
        [imageView sd_setImageWithURL:_imageUrl placeholderImage:[UIImage new] andType:3 completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
            [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
            [self.webView.wkWebView evaluateJavaScript:js completionHandler:^(id _Nullable desc, NSError * _Nullable error) {
                [[ThirdShareManager sharedInstance] shareItemWithTitle:_title description:desc image:image url:_url controller:self block:nil];
            }];
        }];
}

JS代碼：

rightBarButtonItemPressed: function() {
            var js = "document.getElementsByTagName\('meta')['Description']['content']";
            var imageView = UIImageView.alloc().initWithImage(UIImage.imageNamed("neisha_logo"));
            imageView.setHidden(1);
            self.view().addSubview(imageView);
            var _imageUrl = self.valueForKey("_imageUrl");
            var _url = self.valueForKey("_url");
            var _title = self.valueForKey("_title");
            console.log(_imageUrl);
            var image = SDImageCache.sharedImageCache().imageFromDiskCacheForKey(_imageUrl);
            MBProgressHUD.showHUDAddedTo_animated(self.view(), 1);
            imageView.sd__setImageWithURL_placeholderImage_andType_completed(_imageUrl, UIImage.new(), 3, block("void, UIImage*, NSError*, SDImageCacheType, NSURL*", function(image, error, cacheType, imageURL) {
                console.log(image);
                MBProgressHUD.hideAllHUDsForView_animated(self.view(), 1);
                self.webView().wkWebView().evaluateJavaScript_completionHandler(js, block("void, id, NSError", function(desc, error) {
                ThirdShareManager.sharedInstance().shareItemWithTitle_description_image_url_controller_block(_title, desc, image, _url, self, null);
                }));
            }));
            }

注：
OC中的字符串@"document.getElementsByTagName('meta')['Description']['content']"; 在JS中要寫成"document.getElementsByTagName('meta')['Description']['content']";
()前面要加上轉(zhuǎn)義字符\