以下哪个是用于判断是否为闰年()js__basic~day02var year=2020
A.year%4===0 && year%100!==0 && year%400===0
B.year%4===0 && year%100!==0year%400===0
C.year%4===0year%100!==0year%400===0
D.year%4===0year%100!==0 && year%400===0
B、year%4===0 && year%100!==0year%400===0