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){}
}

window.onresize = () => this.screenWidth = window.innerWidth 
// 改为以下写法
window.addEventListener('resize', () => this.screenWidth = window.innerWidth, false)