在做展示分类列表时 ，点击分类按钮 报错 ？

在做展示分类列表时 ，点击分类按钮 报错

VM60779:1 Do not have toggle handler in current page: pages/topics/index. Please make sure that toggle handler has been defined in pages/topics/index, or pages/topics/index has been added into app.json

代码

computed = {
      currentCategoryId () {
        return this.currentCategory.id || 0
      }
    }
    methods = {
      toggle () {
        console.log('toggle is running ....')
        this.categoryOpen = !this.categoryOpen
      },
      async changeCatgory (id = 0) {
        // 找到选中的分类
        this.currentCategory = id ? this.categories.find(category => category.id === id) : {}
        // 点击以后关闭下拉列表
        this.categoryOpen = false
        this.$apply()
        await this.getTopics(1, true)
      }
    }

我目前没有发现错误原因。。