最近使用火车票网的限行网页，但是广告以及头部nav和地步footer都是我们现在所不需要的，所以决定使用js交互，下面所有代码都写在 webViewDidFinishLoad 里面
1.查看原网址的源代码：
NSString *js1 = @"document.documentElement.innerHTML";NSString *pageSource = [webView stringByEvaluatingJavaScriptFromString:js1]; NSLog(@"pagesource:%@", pageSource);
2.编写js代码
NSMutableString *js = [NSMutableString string]; // 删除NAV [js appendString:@"var header = document.getElementById('huoche_nav');"];//获取id为huoche_nav节点 [js appendString:@"header.parentNode.removeChild(header);"];//把节点从父试图中删除 // 删除TOPBAR [js appendString:@"var box = document.getElementById('huoche_topbar');"]; [js appendString:@"box.parentNode.removeChild(box);"]; // 删除footer [js appendString:@"var buyNow = document.getElementById('footer');"]; [js appendString:@"buyNow.parentNode.removeChild(buyNow);"]; [js appendString:@"var form1 = document.getElementById('form1');"]; [js appendString:@"form1.parentNode.removeChild(form1);"]; [js appendString:@"var righttbox = document.getElementsByClassName('righttbox')[0];"]; [js appendString:@"righttbox.parentNode.removeChild(righttbox);"]; [js appendString:@"var height8 = document.getElementsByClassName('center_xianlu height8')[0];"]; [js appendString:@"height8.parentNode.removeChild(height8);"];
3.在webview的代理方法webViewDidFinishLoad中执行js代码
[webView stringByEvaluatingJavaScriptFromString:js];
4.如果需要使用uiwebview双指变大变小，需要添加
webview.scalesPageToFit=YES; webview.multipleTouchEnabled=YES; webview.userInteractionEnabled=YES;
总结：
1.
NSURL *url = [[NSBundle mainBundle] URLForResource:@"index"withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
2.
NSString *str1 = @"var word =document.getElementById('word');";
NSString *str2 = @"word.remove();";
[webView stringByEvaluatingJavaScriptFromString:str1];
[webView stringByEvaluatingJavaScriptFromString:str2];
3.
NSString *str3 = @"var change =document.getElementsByClassName('change')[0];" "change.innerHTML = '!';"; [webView stringByEvaluatingJavaScriptFromString:str3];
4.
NSString *str4 =@"var img = document.createElement('img');" "img.src = 'img_01.jpg';"
"img.width = '160';"
"img.height = '80';"
"document.body.appendChild(img);";
[webView stringByEvaluatingJavaScriptFromString:str4];
5.
NSString *str1 = @"var h1 =document.getElementsByTagName('h1')[0];" "h1.innerHTML='';"; [webView stringByEvaluatingJavaScriptFromString:str1];
6.
NSString *str2=@"document.getElementById('footer').remove();";
[webView stringByEvaluatingJavaScriptFromString:str2];
7.
NSString *str3 = @"document.body.outerHTML"; NSString *html = [webViewstringByEvaluatingJavaScriptFromString:str3];
NSLog(@"%@", html);
在html中调用OC
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:
(NSURLRequest *)request navigationType:
(UIWebViewNavigationType)navigationType{
NSString *str = request.URL.absoluteString;
NSRange range = [str rangeOfString:@"ZJY://"];
if (range.location != NSNotFound) {
NSString *method = [str substringFromIndex:range.location
+ range.length];
SEL sel = NSSelectorFromString(method);
[self performSelector:sel];
}return YES; }
