webview运用js适配html页面

- (void)webViewDidFinishLoad:(UIWebView *)webView{
    webViewDidLoad = YES;
    hideManualHud(0);
    [webView stringByEvaluatingJavaScriptFromString:
     [NSString stringWithFormat:@"var script = document.createElement('script');"
      "script.type = 'text/javascript';"
      "script.text = \"function ResizeImages() { "
      "var myimg,oldwidth;"
      "var maxwidth=%lf;" //缩放系数
      "for(i=0;i <document.images.length;i++){"
      "myimg = document.images[i];"
      "if(myimg.width > maxwidth){"
      "oldwidth = myimg.width;"
      "oldHeight = myimg.height;"
      "myimg.width = maxwidth;"
      "myimg.height = oldHeight * (maxwidth/oldwidth);"
      "}"
      "}"
      "}\";"
      "document.getElementsByTagName('head')[0].appendChild(script);",Screen_Width - 10 ]];
    
    //拦截网页图片  并修改图片大小
    [webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];
}

这个会有个小问题，在实际使用中，网络环境较差就会有一个从大压到小的过程，如果有谁有好的解决方法，可以发评论给我，谢谢大神