Fabric JS在Angular JS中无法正常运行

I am trying to do canvas manipulation with Fabric.js in an Angular.js application, and I can't even get the very basics working. I am just trying to set the background image, but at this point, I can't get that or even basic objects to show up on the canvas. I would really like that background image to be resized to whatever the zoom is set to as in I am trying to do canvas manipulation with Fabr