FabricJS画布无法选择任何对象

通过'loadFromJSON'将有效的JSON对象加载到画布后，我陷入了画布问题 . 画布渲染带有对象的有效画布，甚至是正确的背景图像 . 出于某种原因，我无法选择任何东西 . 如果我尝试单击并选择几个对象，则甚至不显示蓝色选择框 . 我确定该对象是有效的，因为我已经将一个有效的教程对象粘贴到loadFromJSON和我的JSON对象到jsfiddle教程中 .

如果我点击鼠标右键...我会得到一个保存图像选项，如果你问我，这看起来有点奇怪 .

这是我的代码：

canvas.loadFromJSON(data, canvas.renderAll.bind(canvas), function(object, o) {
    o = $.fn.mapCanvasFieldset(object); // custom function
});

canvas.renderAll();

JSON对象（数据var）：

{
   "objects":[
      {
         "type":"image",
         "originX":"left",
         "originY":"top",
         "left":133,
         "top":108,
         "width":267,
         "height":80,
         "fill":"rgb(0,0,0)",
         "stroke":null,
         "strokeWidth":0,
         "strokeDashArray":null,
         "strokeLineCap":"butt",
         "strokeLineJoin":"miter",
         "strokeMiterLimit":10,
         "scaleX":0.33,
         "scaleY":0.33,
         "angle":0,
         "flipX":false,
         "flipY":false,
         "opacity":1,
         "shadow":null,
         "visible":true,
         "clipTo":null,
         "backgroundColor":"",
         "fillRule":"nonzero",
         "globalCompositeOperation":"source-over",
         "transformMatrix":null,
         "skewX":0,
         "skewY":0,
         "src":"",
         "filters":[],
         "resizeFilters":[],
         "crossOrigin":"",
         "alignX":"none",
         "alignY":"none",
         "meetOrSlice":"meet"
      }
   ],
   "background":"",
   "backgroundImage":{
      "type":"image",
      "originX":"left",
      "originY":"top",
      "left":0,
      "top":0,
      "width":350,
      "height":350,
      "fill":"rgb(0,0,0)",
      "stroke":null,
      "strokeWidth":0,
      "strokeDashArray":null,
      "strokeLineCap":"butt",
      "strokeLineJoin":"miter",
      "strokeMiterLimit":10,
      "scaleX":1,
      "scaleY":1,
      "angle":0,
      "flipX":false,
      "flipY":false,
      "opacity":1,
      "shadow":null,
      "visible":true,
      "clipTo":null,
      "backgroundColor":"",
      "fillRule":"nonzero",
      "globalCompositeOperation":"source-over",
      "transformMatrix":null,
      "skewX":0,
      "skewY":0,
      "src":"",
      "filters":[],
      "resizeFilters":[],
      "crossOrigin":"",
      "alignX":"none",
      "alignY":"none",
      "meetOrSlice":"meet"
   }
}

Edit: 也许至关重要的信息;我正在Fancybox中加载我的画布