计算webView的 高度 和自适应屏幕大小

- (void)webViewDidFinishLoad:(UIWebView *)webView{

[webView stringByEvaluatingJavaScriptFromString:

@"var script = document.createElement('script');"

"script.type = 'text/javascript';"

"script.text = \"function ResizeImages() { "

"var myimg,oldwidth;"

"var maxwidth=305;" //缩放系数

"for(i=0;i <document.images.length;i++){"

"myimg = document.images[i];"

"if(myimg.width > maxwidth){"

"oldwidth = myimg.width;"

"myimg.width = maxwidth;"

"}"

"}"

"}\";"

"document.getElementsByTagName('head')[0].appendChild(script);"];

[webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];

CGRect frame = webView.frame;

frame.size.height = 1;

webView.frame = frame;

CGSize fittingSize = [webView sizeThatFits:CGSizeZero];

frame.size = fittingSize;

webView.frame = frame;

[self updateScrollViews:frame];

}