Javascript 如何像全局变量一样从方法将数据插入arrayList

我需要将数据从数据库插入到

ArrayList

，以后需要使用它，但我无法直接创建它。那我怎么办

ngOnInit() { 
var result_array = [];
    this.get_All_Col_data(myfrugalmap,result_array,Marker_array);
    }    

 get_All_Col_data(map,collection_array,markers){
    const myIcon_Col = L.icon({
      iconUrl: 'https://img.icons8.com/ultraviolet/40/000000/collect.png'
    });
    const myIcon_vente = L.icon({
      iconUrl: 'https://img.icons8.com/color/50/000000/low-price-euro.png'
    });
    this.CollectionService.getallCollections().subscribe((data: Collection_info[]) =>{
      this.Collection_info = data;
      for(var i =0; i<this.Collection_info.length;i++){
        console.log("name :" + this.Collection_info[i].emailcol);
        console.log("type :" + this.Collection_info[i].type);
        if(this.Collection_info[i].type==='collection'){
             var m = L.marker([Number(this.Collection_info[i].lat_col), Number(this.Collection_info[i].long_col)], {icon: myIcon_Col}).addTo(map);
                 m.bindPopup("Collection pt " + this.Collection_info[i].nom_col);
                 markers.push(m);
                 collection_array.push(this.Collection_info[i]);

            }else{
          var m = L.marker([Number(this.Collection_info[i].lat_col), Number(this.Collection_info[i].long_col)], {icon: myIcon_vente}).addTo(map);
          m.bindPopup("Collection vente " + this.Collection_info[i].nom_col);
          collection_array.push(this.Collection_info[i]);
          markers.push(m);
        }
      }
      console.log(collection_array)
      return collection_array;
     });

ngOnInit（）{
var结果_数组=[]；
获取所有列数据（myfrugalmap、结果数组、标记数组）；
}    
获取所有列数据（地图、集合数组、标记）{
常量myIcon\u Col=L.icon({
伊克努尔：'https://img.icons8.com/ultraviolet/40/000000/collect.png'
});
常数myIcon\u vente=L.icon({
伊克努尔：'https://img.icons8.com/color/50/000000/low-price-euro.png'
});
this.CollectionService.getallCollections（）.subscribe（（数据：Collection_info[]）=>{
this.Collection_info=数据；
对于（var i=0；i尝试以下方法：

export class Test implements OnInit {
    result_arr = [];

    ngOnInit() {
         this.get_All_Col_data(myfrugalmap, Marker_array)
    }

    get_All_Col_data(map, markers){
        const myIcon_Col = L.icon({
            iconUrl: 'https://img.icons8.com/ultraviolet/40/000000/collect.png'
        });
        const myIcon_vente = L.icon({
        iconUrl: 'https://img.icons8.com/color/50/000000/low-price-euro.png'
        });
        this.CollectionService.getallCollections().subscribe((data: Collection_info[])                                 
         =>{
             this.Collection_info = data;
             for(var i =0; i<this.Collection_info.length;i++){
               console.log("name :" + this.Collection_info[i].emailcol);
               console.log("type :" + this.Collection_info[i].type);
               if(this.Collection_info[i].type==='collection'){
                   var m = L.marker([Number(this.Collection_info[i].lat_col), 
                   Number(this.Collection_info[i].long_col)], {icon: myIcon_Col}).addTo(map);
                   m.bindPopup("Collection pt " + this.Collection_info[i].nom_col);
                   markers.push(m);
                  this.result_arr.push(this.Collection_info[i]);
               }else{
                   var m = L.marker([Number(this.Collection_info[i].lat_col), 
                   Number(this.Collection_info[i].long_col)], {icon: myIcon_vente}).addTo(map);
                   m.bindPopup("Collection vente " + this.Collection_info[i].nom_col);
                   this.result_arr.push(this.Collection_info[i]);
                   markers.push(m);
              }
          }
       console.log(this.result_arr)
       });
}

导出类测试实现OnInit{
结果_arr=[]；
恩戈尼尼特（）{
获取所有列数据（myfrugalmap、标记数组）
}
获取所有颜色数据（地图、标记）{
常量myIcon\u Col=L.icon({
伊克努尔：'https://img.icons8.com/ultraviolet/40/000000/collect.png'
});
常数myIcon\u vente=L.icon({
伊克努尔：'https://img.icons8.com/color/50/000000/low-price-euro.png'
});
this.CollectionService.getallCollections（）.subscribe（（数据：Collection_info[]））
=>{
this.Collection_info=数据；
对于（var i=0；i