angularJS select下拉框检测改变

html:（已引入amazeUI）

<div style="width:70px;display:inline-block;">
     <form class="am-form am-form-inline" >
         <div class="am-input-group am-form-icon am-form-feedback ">
             <span class="am-input-group-btn">
                 <select ng-model="type" ng-options="t.value as t.name for t in typeOptions" 
　　　　　　　　　　　　class="am-form-field am-input-sm" id="typeOption" ng-change="typeChange()">    //注：一定是typeChange(),而不是typeChange
                 </select>
             </span>
         </div>
     </form>
</div>

js:

$scope.type = '1';
$scope.typeOption = [{
        　　name:'全部',
        　　value:'1'
        },
        {
            name:'今天',
            value:'2'
        },
        {
            name:'昨天',
            value:'3'
        },
        {
            name:'上一月',
            value:'4'
        }];

$scope.typeChange = function(){
　　console.log('type',$scope.type);
　　...
}