mpvue小程序里setData is not a function

Question

created (){
  let _this = this;
  wx.getLocation({
        type: 'wgs84',
        success(res) {
            const latitude = res.latitude
            const longitude = res.longitude
            const speed = res.speed
            const accuracy = res.accuracy
            console.log('-d---------------------')
            console.log(res);
           _this.setData({
          latitude: res.latitude,
          longitude: res.longitude,
          markers: [{
            id: "1",
            latitude: res.latitude,
            longitude: res.longitude,
            width: 50,
            height: 50,
            iconPath: "../images/my.png",
            title: "我的当前位置"
          }]
        })
        }
        })
 },

mpvue的小程序方法里面写了这样一个方法 用来定位到用户当前的地理位置 提示 thirdScriptError
_this.setData is not a function;at api getLocation success callback function
TypeError: _this.setData is not a function