我想在订阅表单中输入电话号码并由图书馆进行验证intlTelInput，这是我的代码：
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="flags.min.css">
<link rel="stylesheet" type="text/css" href="css2.css">
<link rel="stylesheet" type="text/css" href="bootstrap-social.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="build/css/intlTelInput.css">
<script src="google/jquery-1.11.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<div class="container">
<div class="row flex-grow">
<div class="col-xs-offset-1 col-xs-10 col-lg-12 col-lg-offset-0">
<div class="row" id="grad1">
<br>
<div class="col-xs-offset-1 col-xs-10 col-lg-offset-4 col-lg-4">
<form method="post" action="serv2.php" onsubmit="return submitForm(this);">
<fieldset>
<div class="row">
<div class="form-group phone">
<input type="tel" class="form-control" id="phone" name="phone" placeholder="Phone number" /> …