//js代码，声明1个数组，对img 进行遍历，采用，分割多个url

   NSString * getAllImages = @"var str = new Array();"

                                "$('img').each(function(){str.push($(this).attr('src'));});" "str.join(',') ";

    NSString * imagerUrls = [self.webView stringByEvaluatingJavaScriptFromString: getAllImages];

    NSLog(@"%@", imagerUrls);