这是因为 javascript 的 var 变量只有函数作用域导致的。把代码修改如下就好了var newNode
改成let newNode
let 可放心使用，详见 http://www.cocos.com/docs/creator/scripting/reference/javascript-support.html
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求助：关于批量创建Prefab的资源加载问题
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