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Detailed explanation of classic js closure

零下一度
Release: 2017-07-20 17:12:06
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When I re-read js closure, I saw "Classic JS Closure Interview Questions Most People Do Wrong", and I understood and recorded my thoughts. Many bloggers have already explained it in detail, but the explanation behind it is a bit convoluted.

Post the code first

                fun:                   a = fun(0 a.fun(1 a.fun(2 a.fun(3   b=fun(0).fun(1).fun(2).fun(3  c= fun(0).fun(1 c.fun(2 c.fun(3);
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Question: What is each output?

Answer:

undefined,0,0,0undefined,0,1,2undefined,0,1,1
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Let’s break it down step by step:

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