shibeirencai_wechat/pages/topics/message/index.js

// pages/topics/common/message/index.js
import { TopicModel } from '../../../models/topic.js'
let topicModel = new TopicModel()

Component({
  /**
   * 组件的属性列表
   */
  properties: {

  },

  /**
   * 组件的初始数据 
   */
  data: {
    textAreaString:""
  },

  /**
   * 组件的方法列表
   */
  methods: {
    bindTextAreaInput(e) {
      this.setData({
        textAreaString: e.detail.value
      })
    },
    submit() {
      if (this.data.textAreaString === ''){
        wx.showModal({
          title: '提示',
          content: '请输入留言内容',
          showCancel:false
        })
        return
      }

      topicModel.addMessage(this.data.textAreaString,res=>{
        console.log(res)
        if(res.code === 200){
          this.setData({
            textAreaString: ''
          })

          wx.showToast({
            title: res.message,
            icon: 'success'
          })
        }
      })
      
    }
  }
})