iOS中，当我们要去掉webView上的长按手势时

比如iOS中内嵌H5页面，我们不要长按出现复制，放大镜之类的功能

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

    [self.webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitUserSelect='none';"];

    [self.webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitTouchCallout='none';"];

}