ES6's let const var difference - Code World

ES6's let const var difference

Others 2021-03-03 04:19:25 views: null

[1] Var is a variable that can be declared in advance, it has no scope, the default is, there is no need to always write var

b=3
b //3

[2] Let can not declare front variables (must be defined before use, exists in the block-level scope)

a=3
let a//undefined

[3] The constant declared by const cannot be changed
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Origin blog.csdn.net/qq_42782491/article/details/113553797

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