VueJS从另一个方法访问一个方法

我正在使用VueJS制作足够简单的资源管理游戏/界面。目前，我希望roll每12.5秒激活一次该功能，并将结果用于其他功能。目前，尽管我不断收到以下错误：

未捕获的TypeError：无法读取未定义的属性“ roll”（...）

我试过了：

app.methods.roll(6);
app.methods.roll.roll(6);
roll.roll()
roll()

但似乎无法访问该功能。任何人有任何想法我将如何实现？

methods: {

  // Push responses to inbox.
  say: function say(responseText) {
    console.log(responseText);
    var pushText = responseText;
    this.inbox.push({ text: pushText });
  },

  // Roll for events
  roll: function roll(upper) {
    var randomNumber = Math.floor(Math.random() * 6 * upper) + 1;
    console.log(randomNumber);
    return randomNumber;
  },

  // Initiates passage of time and rolls counters every 5 time units.
  count: function count() {
    function counting() {
      app.town.date += 1;
      app.gameState.roll += 0.2;

      if (app.gameState.roll === 1) {
        var result = app.methods.roll(6);
        app.gameState.roll === 0;
        return result;
      }
    }

    setInterval(counting, 2500);

    ...

    // Activates the roll at times.
  }
}

created() { this.initialize(); }, methods: { async initialize() { //code here....... this.getExcellSheet(); //method call }, async getExcellSheet() { //code here....... } }

var vm = new Vue({ ... methods: { methodA() { // Method A }, methodB() { // Method B // Call `methodA` from inside `methodB` this.methodA() }, }, ... });