nw.js 如何禁用向主窗口拖放文件？
由于主界面其实就是 Chrome 的浏览器窗口，所以沿袭了它的一些行为，例如将外部文件拖进窗口时，node-webkit 会尝试打开文件比如如果文件是图片，那么主窗口就会直接显示出这张图片，如果不禁用这个行为的话实在太容易穿帮了。
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作者：玄魂
链接：http://zhuanlan.zhihu.com/xuanhun/20502858
来源：知乎
其实拖放（drag-drop）操作是Html5的功能，不是nw.js的内置API，那么我们采用Html5应用一般的处理方法就可以了。
首先我们看一下一个正常的页面，直接拖放一个文件过来的效果。
页面代码：
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