Method bindNavigation

js/ReadingSystem.js:1097–1108

* 绑定导航事件

()

   * 绑定导航事件
   */
  bindNavigation() {
    if (this.bindingFlags.navigation) return;
    this.bindingFlags.navigation = true;

    if (this.dom.prevUnitBtn) {
      on(this.dom.prevUnitBtn, 'click', () => this.loadPreviousUnit());
    }

    if (this.dom.nextUnitBtn) {
      on(this.dom.nextUnitBtn, 'click', () => this.loadNextUnit());
    }
  }

  /**
   * 绑定翻译切换事件