事件篇：
实例：(点击按钮内容加1)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body ng-app="">
<p>点击按钮:</p>
<button ng-click="count = count + 1" ng-init="count=0">OK</button>
<p>按钮被点击了 {{count}} 次。</p>
<p>实例中，按钮每被点击一次变量 "count" 会自动加 1。</p>
</body>
</html>
API：
AngularJS 事件
AngularJS 支持以下事件:
- ng-click
- ng-dbl-click
- ng-mousedown
- ng-mouseenter
- ng-mouseleave
- ng-mousemove
- ng-keydown
- ng-keyup
- ng-keypress
- ng-change