const round_1=Math.round(1.4)

const round_2=Math.round(1.5)

const round_3=Math.round(1.6)

const round_4=Math.round(-1.4)

const round_5=Math.round(-1.5)

const round_6=Math.round(-1.6)

​

document.write('Math.round()▶반올림값','<br>')

document.write('Math.round(1.4) : ')

document.write(round_1)

document.write('<br>','Math.round(1.5) : ')

document.write(round_2)

document.write('<br>','Math.round(1.6) : ')

document.write(round_3)

document.write('<br>','Math.round(-1.4) : ')

document.write(round_4)

document.write('<br>','Math.round(-1.5) : ')

document.write(round_5)

document.write('<br>','Math.round(-1.6) : ')

document.write(round_6)