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- round ceil floor
let num = 555.555
_.round(num) // 556
_.round(num, 1) // 555.6
_.round(num, -1) // 560
// 和round用法相似
_.ceil(num, -1) // 560
_.floor(num, -1) // 550
// 参数为string
_.round('555.555') // 556, 会先toNumber
// 参数为负数
_.round(-555.555) // -556, the nearest number
_.ceil(-555.555) // -555, the smallest number greater than or equal to
_.floor(-555.555) // -556, the greatest number smaller than or equal to
// todo: 实现myRound(n, precision)