[webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"idNumber\").value=http://www.mamicode.com/"6217000x10055975513\";"];

    [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"username\").value=http://www.mamicode.com/"于淇\";"];

NSString *username = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"username\").value;"];

    NSString *account = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"idNumber\").value;"];

CGFloat height = [[webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName(‘tips-login‘)[0].offsetHeight"] floatValue];

    [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName(‘tips-login‘)[0].style.margin=\"0.3rem 3.5rem 0 3.5rem\""];

NSString *info = [[UIDevice currentDevice] name];

        NSString *js = [NSString stringWithFormat:@"showInfo(\"name\",\"%@\")",info];

        NSString *jx = [self.webView stringByEvaluatingJavaScriptFromString:js];

iOS js