AngularJS 刷新指令(directive)

Link 函數是工廠方法,只會在編譯器第一次匹配到指令時調用一次.需要使用$watch 方法來監聽數據(model)的變化.

function collapseNav() {
    var directive = {
        restrict: 'A',
        link: link
    };
    return directive;
    function link(scope, ele, attrs) {
        scope.$watch("collapseNav", 
        function(newValue,oldValue) {
            //This gets called when data changes.
        });
    }
}