private void ConvertJsonToString(System.Text.StringBuilder sb)
 {
     sb.Append("{\n\t\"assets\":[\n");
     for (int i = 0; i < this._assets.Count; i++)
     {
         var           assetUrl = this._assets[i];
         MyJson_Object asset    = new MyJson_Object();
         sb.Append("\t\t");
         // sb.Append(asset.ToString());
         sb.Append('"' + assetUrl + '"');//现在版本Asset只导出url
         if (i != this._assets.Count - 1)
         {
             sb.Append(',');
         }
         sb.Append("\n");
     }
     sb.Append("\t],\n\t\"objects\":[\n");
     for (int i = 0; i < this._objects.Count; i++)
     {
         MyJson_Object obj = this._objects[i];
         sb.Append("\t\t");
         sb.Append(obj.ToString());
         if (i != this._objects.Count - 1)
         {
             sb.Append(',');
         }
         sb.Append("\n");
     }
     sb.Append("\t],\n\t\"components\":[\n");
     for (int i = 0; i < this._comps.Count; i++)
     {
         MyJson_Object comp = this._comps[i];
         sb.Append("\t\t");
         sb.Append(comp.ToString());
         if (i != this._comps.Count - 1)
         {
             sb.Append(',');
         }
         sb.Append("\n");
     }
     //
     sb.Append("\t],\n");
     sb.Append("\n\t\"version\":" + VERSION + "\n}");
 }