topic description
Why do you use let to declare variables to achieve the effect of outputting "0, 1, 2, 3"
Why do you use let to declare variables to achieve the effect of outputting "0, 1, 2, 3"
background knowledge. Scope involving let and var
background knowledge 2. SetTimeout is executed asynchronously, and it will not be executed until the Synchronize code is complete. In this case, the function in each setTimeout will not be executed until the for loop has finished running.
process deduction:
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