simplesytle.js

var options = {
  style:function(feature){
    if(!feature.properties){
      return;
    }
    var out = {};
    if(feature.properties.stroke){
      out.color = feature.properties.stroke;
    }
    if(feature.properties["fill-opacty"]){
      out.opacity = feature.properties["stroke-opacity"];
    }
    if(feature.properties["fill-opacty"] === 0){
      out.stroke = false;
    }else if (feature.properties["stroke-width"]){
      out.weight = feature.properties["stroke-width"];
    }
    if(feature.properties.fill){
      out.fillColor = feature.properties.fill;
    }
    if(feature.properties["fill-opacty"] === 0){
      out.fill = false;
    }else if(feature.properties["fill-opacty"]){
      out.fillOpacity = feature.properties["fill-opacty"];
    }
    return out;
  }
}