angularJs初学遇到的坑之directive

angularJs初学遇到的坑之directive

angular.module('indexApp',[])
.directive('increasea',function(){
return function (scope,element,attr){
element.on("click",function(){
scope.a++;
scope.$digest();
});
};
})
.controller('indexContrl',function($scope){

$scope.a = 1;
$scope.$watch('a',function(newVal){
console.log('a:'+newVal);
});
});
```html部分：

<div class="se-preview-section-delimiter"></div>

<div ng-controller="indexContrl">
<button increasea>点击</button>
<span>点击次数：</span><span ng-bind="a"></span>
</div>