Wechat program typeerror: a solution to cannot read property ‘SetData’ of undefined

Questions

In the custom click event function, there is an error calling SetData, indicating that it is undefined

reason

The current this refers to the instance object of the success function

delTaskTap(e){
    wx.showModal({
      title:'Tips',
      content:'Do I have to clear all my to-do lists?',
      success:function(res){
        if(res.confirm){
          this.setData({
            taskText:[]
          })
          console.log('Clear all to-do items')
        }
        else if(res.cancel){
          console.log('Not clearing all to-do items')
        }
      }
    })

terms of settlement

delTaskTap(e){
    var that=this
    wx.showModal({
      title:'Tips',
      content:'Do I have to clear all my to-do lists?',
      success:function(res){
        if(res.confirm){
          that.setData({
            taskText:[]
          })
          console.log('Clear all to-do items')
        }
        else if(res.cancel){
          console.log('Not clearing all to-do items')
        }
      }
    })


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