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Node + Express + MongoDB

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打开进入编辑器后就空的,没有可编辑的组件。 ![1528474082 1](https://user-images.githubusercontent.com/25011367/41168733-73852b9e-6b79-11e8-9a51-ca74cea49c7a.jpg)

我前端把图片位置改变了,后端怎么根据我移动东西生成图片对应区域图片?