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第一层定义：闭包是基于词法作用域（或静态作用域）书写代码时所产生的自然结果
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第二层定义：当函数在别处调用时，依然需要访问它的父作用域的变量
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完整定义：当函数可以记住并访问所在的词法作用域, 即使函数是在当前词法作用域之外执行, 这时就产生了闭包
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