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easy to bring out the scope chain, and finished. It's all easy to have the foundation of the previous sections, otherwise it will be difficult to explain.Let's start with a formal talk about a friend who's always looking forward to it--closures. Please look forward to the next section.---------------------------------------------------------------------------This article has been updated to the directory of in-depth understanding of JavaScript protot

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matter where the FN function will be called.What is described above is just a cross-step scope to look for.What if it's a step that hasn't been found yet? --Then cross! --continues across the global scope. If it's not found in the global scope, it's really gone.This step-by-step "cross" route, as we call it, is a chain of scopes.Let's summarize this "scope chain" procedure taken from a variable: (assuming A is free)In the first step, now the current

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