<select ng-model="vm.selectVal" ng-options="o.id as o.title for o in vm.optionsData" ng-change="selectChange()">
    <option value="">請選擇</option>
</select>

vm.optionsData = [{
    id : 4543,
    title : "angularJs"
},{
    id : 546,
    title : "emberJs"
},{
    id : 456,
    title : 
 
"backboneJs"
},{
    id : 75,
    title : "knockoutJs"
}];
 
$scope.selectChange = function(){
    //添加了ng-change事件來試試id值的輸出
    console.log(vm.selectVal);
}

原文：https://www.cnblogs.com/leejersey/p/4663949.html