如上圖所示，我們需要實現如下這些驗證功能：
通過AngularJS，我們可以很輕松的實現這些要求，只需要1行JS代碼。UI樣式這裡采用的是Bootstrap。先上示例代碼：
HTML
<!DOCTYPE html>
<html lang="zh-cn" ng-app="ftitApp">
<head>
<meta charset="utf-8" />
<title>Demo</title>
<link href="/Content/bootstrap.css" rel="stylesheet"/>
<script src="/Scripts/angular.js"></script>
</head>
<body>
<div class="container body-content">
<!-- 主要內容區域 -->
<div class="row main-content">
<div class="col-md-9">
<!-- 聯系我們表單區域 -->
<form action="/Contact/Create" method="post" role="form" name="createContactForm" ng-controller="ContactCreateController">
<!-- UserName 您的稱呼 -->
<div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.UserName.$pristine && createContactForm.UserName.$valid, 'has-error' : !createContactForm.UserName.$pristine && createContactForm.UserName.$invalid }">
<label for="UserName">您的稱呼*</label>
<input type="text" class="form-control" ng-model="userName" name="UserName" autofocus="" required ng-maxlength=30>
<div ng-show="!createContactForm.UserName.$pristine && createContactForm.UserName.$valid">
<span class="glyphicon glyphicon-ok form-control-feedback"></span>
</div>
<div ng-show="!createContactForm.UserName.$pristine && createContactForm.UserName.$invalid">
<span class="glyphicon glyphicon-remove form-control-feedback"></span>
</div>
</div>
<!-- UserMail 郵箱地址 -->
<div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.UserMail.$pristine && createContactForm.UserMail.$valid, 'has-error' : !createContactForm.UserMail.$pristine && createContactForm.UserMail.$invalid }">
<label for="UserMail">郵箱地址*</label>
<input type="email" class="form-control" ng-model="userMail" name="UserMail" required ng-maxlength=30>
<div ng-show="!createContactForm.UserMail.$pristine && createContactForm.UserMail.$valid">
<span class="glyphicon glyphicon-ok form-control-feedback"></span>
</div>
<div ng-show="!createContactForm.UserMail.$pristine && createContactForm.UserMail.$invalid">
<span class="glyphicon glyphicon-remove form-control-feedback"></span>
</div>
</div>
<!-- Subject 主題 -->
<div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.Subject.$pristine && createContactForm.Subject.$valid, 'has-error' : !createContactForm.Subject.$pristine && createContactForm.Subject.$invalid }">
<label for="Subject">主題*</label>
<input type="text" class="form-control" ng-model="subject" name="Subject" required ng-maxlength=100>
<div ng-show="!createContactForm.Subject.$pristine && createContactForm.Subject.$valid">
<span class="glyphicon glyphicon-ok form-control-feedback"></span>
</div>
<div ng-show="!createContactForm.Subject.$pristine && createContactForm.Subject.$invalid">
<span class="glyphicon glyphicon-remove form-control-feedback"></span>
</div>
</div>
<!-- Content 內容 -->
<div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.Content.$pristine && createContactForm.Content.$valid, 'has-error' : !createContactForm.Content.$pristine && createContactForm.Content.$invalid }">
<label for="Content">內容*</label>
<textarea cols="4" rows="5" class="form-control" ng-model="content" name="Content" required ng-maxlength=1000></textarea>
<div ng-show="!createContactForm.Content.$pristine && createContactForm.Content.$valid">
<span class="glyphicon glyphicon-ok form-control-feedback"></span>
</div>
<div ng-show="!createContactForm.Content.$pristine && createContactForm.Content.$invalid">
<span class="glyphicon glyphicon-remove form-control-feedback"></span>
</div>
</div>
<!-- 提交按鈕 -->
<div class="form-group">
<div ng-show="createContactForm.$valid">
<input type="image" src="/Content/images/comment_publish_button.png" onsubmit="submit();" value="發布" ng-disabled='!createContactForm.$valid' />
</div>
<div ng-show="!createContactForm.$valid">
<img src="/Content/images/invalid_publish_button.png" />
</div>
</div>
</form>
</div>
</div>
</div>
<script src="/Scripts/ftit/ContactCreateController.js"></script>
</body>
</html>
JS代碼（真的只有一行喲）
ContractCreateController.js
var ftitAppModule = angular.module('ftitApp', []);
這樣就好啦。幾個關鍵的地方解釋一下：
更細節的技術問題請查看AngularJS的技術文檔。
AngularJS權威教程 清晰PDF版 http://www.linuxidc.com/Linux/2015-01/111429.htm
希望你喜歡，並分享我的工作~帶你走近AngularJS系列：
如何在 AngularJS 中對控制器進行單元測試 http://www.linuxidc.com/Linux/2013-12/94166.htm
在 AngularJS 應用中通過 JSON 文件來設置狀態 http://www.linuxidc.com/Linux/2014-07/104083.htm
AngularJS 之 Factory vs Service vs Provider http://www.linuxidc.com/Linux/2014-05/101475.htm
AngularJS —— 使用 ngResource、RESTful APIs 和 Spring MVC 框架提交數據 http://www.linuxidc.com/Linux/2014-07/104402.htm
AngularJS 的詳細介紹：請點這裡
AngularJS 的下載地址：請點這裡
