Ra
window.innerWidth
window.innerHeightSize: a a a
Ra
window.innerWidth
window.innerHeightF
F
KS

KS
KS
AK
V
MK
MK
V
MK
MK
MK
MK
const a = new Map()
a.set(1, '1')
a.set('1', '2')
a.get(1) === '1' => true
a.get('1') === '2' => true
MK
V
MK
const b = {}
b[1] = 1
b['1'] = 2
b[1] === 2 => true
b['1'] === 2 => trueV
V