微信小程序this.setData

来源：12-1 wx.request的更多参数讲解

慕斯9212296

2023-08-06

data: {
  daAn1:"good"
  },
onLoad(options) {
    wx.request({
      url: 'http://localhost/zerg/public/index.php/api/v1.banner/getquestionbyid?id=100001&id1=个税',
      success(res){
          console.log(res.data[0].course_name)
          this.setData({
            daAn1:res.data[0].course_name
          })
      }
    })
  },

我用以上代码，从服务器返回值，用 console.log(res.data[0].course_name)，打印，显示成功，结果就是一个字符串：“个税”，但我想把这个返回值用this.setData做数据绑定给已经定义好的变量daAn1时,总是显示错误：

WAServiceMainContext.js:2
TypeError: Cannot read property ‘setData’ of undefined
at success (zhan.js? [sm]:21)
at Function.forEach.s. (WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2)
at :49654/appservice/
at WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2
at u (WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2)
at o. (WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2)
at :49654/appservice/
at WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2
at WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2
at WASubContext.js?t=wechat&s=1691319802498&v=2.19.4:2(env: Windows,mp,1.06.2306020; lib: 2.19.4)

请问为什么数据绑定不成功？

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