iOS 加载js获取webView中图片url

- (void)webViewDidFinishLoad:(UIWebView *)webView
{//这里是js，主要目的实现对url的获取
    static  NSString * const jsGetImages =
    @"function getImages(){\
    var objs = document.getElementsByTagName(\"img\");\
    var imgScr = '';\
    for(var i=0;i<objs.length;i++){\
    imgScr = imgScr + objs[i].src + '+';\
    };\
    return imgScr;\
    };";
    [webView stringByEvaluatingJavaScriptFromString:jsGetImages];//注入js方法
    NSString *urlResurlt = [webView stringByEvaluatingJavaScriptFromString:@"getImages()"];
    mUrlArray = [NSMutableArray arrayWithArray:[urlResurlt componentsSeparatedByString:@"+"]];
    if (mUrlArray.count >= 2) {
        [mUrlArray removeLastObject];
    }
    DLog(@"%@",mUrlArray);
}

其中mUrlArray为可变数组，用来盛放web中的图片url组。