如何在Angular.js中使用multipledropdown.js设置复选框为只读

<div ng-app="myApp" ng-controller="myCtrl">
    <multiple-dropdown ng-model="selectedOptions" options="dropdownOptions" ng-disabled="isReadOnly"></multiple-dropdown>
</div>

var app = angular.module('myApp', []);

app.controller('myCtrl', function($scope) {
    $scope.dropdownOptions = [
        { name: 'Option 1', value: 1 },
        { name: 'Option 2', value: 2 },
        { name: 'Option 3', value: 3 },
    ];

    $scope.selectedOptions = [];

    $scope.isReadOnly = true; // 设置为只读

    // 其他相关功能代码
});