// 查寻签到状态 this.data.last_sign = 从数据库获取到的上次签到时间

data: {
  qiand: "签到",
}

  types(){
    console.log(this.data.last_sign);
    const date = new Date()
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
    let times = year +'-'+ month +'-'+ day
    // 获取到当前时间
    console.log(times);
    this.setData({
      time: times,
    })
    if (this.data.last_sign == times) {
      this.setData({
        qiand: "已签到",
      })
    }
  },

点击判断上次签到时间等不等于当前时间

// 点击签到   
  sign(){
    if (this.data.last_sign == this.data.time) {
      console.log("已签到"); 
      return false
    } else {  
      const that = this
      require_my.my_request({
        url: app.globalData.url + 'api/day_sign/',
        data:{
          id: app.globalData.ids
        },
      })
      .then(value => {
        console.log(value);
        that.setData({
          qiand: "已签到",
        })
        wx.showModal({
          title: '签到成功',
          content: value.data.message,
          success (res) {
            if (res.confirm) {
              console.log('用户点击确定')
            } else if (res.cancel) {
              console.log('用户点击取消')
            }
          }
        })
      })
      .catch(seaon => {
        wx.showModal({
          title: '签到失败',
          content: '请重新签到',
          success (res) {
            if (res.confirm) {
              console.log('用户点击确定')
            } else if (res.cancel) {
              console.log('用户点击取消')
            }
          }
        })
      })
    }
  },

注意: 日期要看后台传过来的日期 , 查看小于10时前面要不要加0
request 封装函数 查看 https://www.jianshu.com/p/989caa15b668