解決 that.setData is not a function

that.setData is not a function;at api request success callback function
TypeError: that.setData is not a function

getMyLocation(){
    var qqmapsdk = new QQMapWX({ key:'xxxx'})
            var that = this;
        wx.getLocation({
         type:"gcj02",
                success(res){
           qqmapsdk.reverseGeocoder({
             success: function(res){
               regionWX[0]=res.result.address_component.province;
               regionWX[1]=res.result.address_component.city;
               regionWX[2]=res.result.address_component.district;
               that.setData({
                 region:regionWX
               })
             },

」

是不是需要在外层声明 var that = this

解决了吗？我也是在写这个位置获取的时候遇到这个问题