Math.round(11.5)等於多少？ Math.round(-11.5)等於多少？
Math.round(11.5)==12
Math.round(-11.5)==-11
round方法返回与参数最接近的长整数，参数加1/2后求其floor.
Math.round(-11.5)==-11
round方法返回与参数最接近的长整数，参数加1/2后求其floor.
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