ng-change学习笔记
注意事项1： 当值改变时，ng-change绑定的expression会立即执行，而不像on-change事件（需要用户离开Form元素或点击回车） 注意事项2： 不会触发ng-change的情况有以下几种：
- 如果通过
$parsers返回的值没有改变，则不会触发（if the value returned from the $parsers transformation pipeline has not changed）
- 如果当前input处于invalid状态，model的值为null，则不会触发（if the input has continued to be invalid since the model will stay null）
- 如果model的值是通过编程的方式进行改变的而不是改变input value，则不会触发(if the model is changed programmatically and not by a change to the input value)
官方Code
<script>
angular.module('changeExample', [])
.controller('ExampleController', ['$scope', function($scope) {
$scope.counter = 0;
$scope.change = function() {
$scope.counter++;
};
}]);
</script>
<div ng-controller="ExampleController">
<input type="checkbox" ng-model="confirmed" ng-change="change()" id="ng-change-example1" />
<input type="checkbox" ng-model="confirmed" id="ng-change-example2" />
<label for="ng-change-example2">Confirmed</label><br />
<tt>debug = {{confirmed}}</tt><br/>
<tt>counter = {{counter}}</tt><br/>
</div>
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