angular实现select的ng-options

<div ng-controller="ngSelect">
    <select ng-model="vm.selectVal" ng-options="o.title for o in vm.optionsData">
        <option value="">请选择</option>
    </select>
</div>

var app = angular.module("app",[]);
app.controller("ngSelect",function($scope){
 
    var vm = $scope.vm = {};
 
    //数组对象用来给ng-options遍历
    vm.optionsData = [{
        title : "angularJs"
    },{
        title : "emberJs"
    },{
        title : "backboneJs"
    },{
        title : "knockoutJs"
    }];
 
})

<select ng-model="vm.selectVal" ng-options="o.id as o.title for o in vm.optionsData" ng-change="selectChange()">
    <option value="">请选择</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事件来试试id值的输出
    console.log(vm.selectVal);
}