我正在嘗試更改輸入單選組中所選按鈕的類別。每個按鈕代表一個座位，然后將顯示所選的總數(shù)。   $scope.calculateChecked = function() {      var count = 0;            angular.forEach($scope.data, function(value) {        if(value.checked)          count++;      });            return count;   };這是我的 plunker 示例： http://plnkr.co/edit/wKzcz6TbYmfbL5mW? open=lib%2Fscript.js&deferRun=1What I'm trying to accomplished is that when a particular seat selected (ie: seat 4), then all the previous seat (1,2,3) will be selected automatically, and then calculated as 4 seats price, like so我知道我使用的是過時的版本，但我仍在學(xué)習(xí)基礎(chǔ)知識。提前感謝所有幫助和建議，非常感謝:)