var view = map.getView();
var vs = layer_tile.getSource();
console.log(map.getSize());
console.log(vs.getExtent());
console.log(view.getResolution());
- extent view 18
分辨率: 2.388657133911758 zoom 是: 16
分辨率: 0.5971642834779395 zoom 是: 18
var mm = map.getView().getResolution()/0.5971642834779395;
var sizearr = map.getSize();
var rs = [sizearr[0]*mm,sizearr[1]*mm];