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1, declare variables
where
function
let
const
class
export
and let const
1, a variable declared valid only in the block where the let command
2, to enhance the variable does not exist
3, temporary dead zone
4, not allowed to repeat a statement
5, block-level scope
6, const actually guaranteed, not the value of the variable may not change, but the memory variable points to the
address stored number
7, top-level object of property