Vue使用mounted和created时,this无法指向data中的数据问题

//想要修改data中的gameNum
data(){
    return{
      allGames:'',
      gameNum:0
    }
  }
mounted() {
    axios.post('http://localhost:3000/allGames').then(function (response){
      console.log(response.data.gameNum);//先输出响应回来的gameNum
      this.gameNum=response.data.gameNum;//赋值给data中的gameNum
      console.log(this.gameNum);//然后输出data中的gameNum
      }}

mounted() {
    let that=this;//将vue对象的引用保存在that中
    axios.post('http://localhost:3000/allGames').then(function (response){
      console.log(response.data.gameNum);
      that.gameNum=response.data.gameNum;//使用that来指向vue
      console.log(that.gameNum);
    }}

export default {
     name: "draw",
     data(){      // 定义变量source        
       return {
         source:new ol.source.Vector({wrapX: false}),
       }
     },
    props:{ //接收父组件传递过来的参数
      map:{
        //type:String
      },
    },
mounted(){   //页面初始化方法
    if (map==map){
    }
    var vector = new ol.layer.Vector({
      source: this.source
    });
    this.map.addLayer(vector);
  },
  watch: {   //监听值变化：map值
    map:function () {
      console.log('3333'+this.map);
      //return this.map
      console.log('444444'+this.map);
      var vector = new ol.layer.Vector({
        source: this.source
      });
      this.map.addLayer(vector);
    }
  },
  methods:{   //监听方法  click事件等，执行drawFeatures方法
       drawFeatures:function(drawType){}
}