Math.round():将括号内的数+0.5,然后向下取整
11.5 + 0.5 = 12,向下取整即12
-11.5 + 0.5 = -11,向下取整即-11
Original: https://www.cnblogs.com/xilichenbokeyuan/p/14151174.html
Author: 卫盾
Title: 10 Math.round(11.5) 等于多少,Math.round(-11.5)等于多少
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