iOS webview 交互

-(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='heyuan110';"];

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

    NSLog(@"%@====%@====%@====%@",currentURL,title,js_result,js_result2);

    [webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement('script');"
     "script.type = 'text/javascript';"
     "script.text = \"function myFunction() { "
     "var field = document.getElementsByName('q')[0];"
     "field.value='heyuan110.com';"
     "document.forms[0].submit();"
     "}\";"
     "document.getElementsByTagName('head')[0].appendChild(script);"];
    [webView stringByEvaluatingJavaScriptFromString:@"myFunction();"];  

}