我想知道這樣有什么優點嗎?還是為了什么？比如下面這段代碼: function DemoCtrl ($timeout, $q, $log) {    var self = this;    self.simulateQuery = false;    self.isDisabled    = false;    // list of `state` value/display objects    self.states        = loadAll();    self.querySearch   = querySearch;    self.selectedItemChange = selectedItemChange;    self.searchTextChange   = searchTextChange;    self.newState = newState;}