angular.js - quotation mark problem in angular ng-class

Question

I have a command, ng-class="{glyphicon-chevron-down:isOpened, glyphicon-chevron-right: !isOpened}" in template, to add orders to glyphicon-chevron-down and glyphicon-chevron-right Both quotation marks and double quotation marks will report an error, and no quotation marks will also report an error (if the classname in ng-class has -, it must be quoted). What to do in this situation?

.directive('brandItem', function (){
    return {
        restrict: 'EA',
        require: '^brandList',
        transclude: true,
        replace: true,
        scope: {
            title: '='
        },
        template: '<li ng-click="toggle()" class="list-group-item">'
                    +'<label><span class="glyphicon" ng-class="{glyphicon-chevron-down:isOpened, glyphicon-chevron-right: !isOpened}"></span>&nbsp;{{name}}</label>'
                    +'<p ng-transclude></p>'
                +'</li>',
        link: function (scope, element, attrs, brandListCtrl){
            scope.isOpened = false;
            brandListCtrl.addItem(scope);
            scope.toggle = function (){
                this.isOpened = !this.isOpened;
                brandListCtrl.getOpened(scope);
            }
        }
    }
});

Answer 1

ng-class="{'active':selected}"
Valid under 1.4.5. And so on. . Single quotes should work

Answer 2

First, what is your angular version? This is critical!

For details, see http://stackoverflow.com/questions/15557151/ngclass-style-with-dash-in-key