- (void)viewDidLoad
 {
   [super viewDidLoad];
   webview.backgroundColor = [UIColor clearColor]; 
  webview.scalesPageToFit =YES;
  webview.delegate =self;
  NSURL *url =[[NSURL alloc] initWithString:@"http://www.google.com.hk/m?gl=CN&hl=zh_CN&source=ihp"];
  NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
  [webview loadRequest:request];  
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {  
  NSString *currentURL = [webView stringByEvaluatingJavaScriptFromString:@"document.location.href"]; 

NSString *title = [webview stringByEvaluatingJavaScriptFromString:@"document.title"];

NSString *js_result = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByName('q')[0].value='朱祁林';"]; 

NSString *js_result2 = [webView stringByEvaluatingJavaScriptFromString:@"document.forms[0].submit(); "]; 

NSString *allHtml = @"document.documentElement.innerHTML";
NSString *allHtmlInfo = [webView stringByEvaluatingJavaScriptFromString:allHtml];

NSString *htmlNum = @"document.getElementById('title').innerText";
NSString *numHtmlInfo = [webView stringByEvaluatingJavaScriptFromString:htmlNum];

if ([title compare: @"Google"]＝=NSOrderedSame ) { 
 
  [webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement_x('script');"  
   "script.type = 'text/javascript';"  
   "script.text = "function myFunction() { "  
   "var field = document.getElementsByName('q')[0];"  
   "field.value='朱祁林';"  
   "document.forms[0].submit();"  
   "}";"  
   "document.getElementsByTagName_r('head')[0].appendChild(script);"];   
   
  [webView stringByEvaluatingJavaScriptFromString:@"myFunction();"];  
}