Cesium latitude and longitude

computed: {
  handler() {
    return new this.Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas)
  }
}

    // Get latitude and longitude of the method 
    the getPosition () {
       const _this = the this // this must be converted in about setInputAction method, this points to changes 
      _this.handler.setInputAction ( function (Movement) {
         // Get the screen coordinate 
        var position = movement.endPosition 

        // screen coordinates into world coordinates 
        var Pick = new new _this.Cesium.Cartesian2 (position.x, position.y)
         var of Cartesian = _this.viewer.scene.globe.pick (_this.viewer.camera.getPickRay (Pick), _this.viewer.scene) 

        // world coordinates to latitude and longitude 
        var ellipsoid = _this.viewer.scene.globe.ellipsoid
         IF(cartesian === undefined){

        }else{
          var cartesian3 = new _this.Cesium.Cartesian3(cartesian.x, cartesian.y, cartesian.z)
          var cartographic = ellipsoid.cartesianToCartographic(cartesian3)
          var lat = _this.Cesium.Math.toDegrees(cartographic.latitude)   //这是纬度
          var lng = _this.Cesium.Math.toDegrees(cartographic.longitude)  //这是经度
          _this.latitudeData = lat
          _this.longitudeData = lng
        }
      }, _This.Cesium.ScreenSpaceEventType.MOUSE_MOVE) //_this.Cesium in main.js well equipped with global variables 
    }