ios webview 添加js 解决图片过大问题

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    //修改服务器页面的meta的值
//    NSString *meta = [NSString stringWithFormat:@"document.getElementsByName(\"viewport\")[0].content = \"width=%f, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no\"", webView.frame.size.width];
//    [webView stringByEvaluatingJavaScriptFromString:meta];
    NSString *js = @"function imgAutoFit() { \
    var imgs = document.getElementsByTagName('img'); \
    for (var i = 0; i < imgs.length; ++i) {\
    imgs[i].setAttribute('style','margin: 10px auto 0px; padding: 0px; display: block; max-width: 100%; height: auto;');   \
    } \
    }";
    [webView stringByEvaluatingJavaScriptFromString:js];
    [webView stringByEvaluatingJavaScriptFromString:@"imgAutoFit()"];
}