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聊一聊什么是闭包？ #58

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zhuguly-zz opened this issue Aug 5, 2020 · 0 comments
Open

聊一聊什么是闭包？ #58

zhuguly-zz opened this issue Aug 5, 2020 · 0 comments

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@zhuguly-zz
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闭包是由函数以及创建该函数的词法环境组合而成的，这个环境包含了闭包创建时能够访问的所有局部变量。
函数连同它作用域链上的要使用的变量共同构成闭包，简单来说，函数1中返回了函数2，而函数2中用到了函数1中的局部变量，这就构成了闭包。
一般情况下使用闭包是为了封装数据和暂存数据，也可以让对象拥有私有属性。
题目来自饥人谷
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