概述

Math.log1p() 函数返回一个数字加1后的自然对数 (底为 E), 既log(x+1).

语法

Math.log1p(x)

参数

x
任意数字.

描述

如果参数的值小于 -1, 则返回 NaN.

函数 y = log(x+1) 的图形是这样的:

 log(x+1)

示例

Math.log1p(Math.E-1)  // 1
Math.log1p(0)         // 0
Math.log1p("0")       // 0
Math.log1p(-1)        // -Infinity
Math.log1p(-2)        // NaN
Math.log1p("foo")     // NaN

规范

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
Math.log1p		 Standard Initial definition.

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相关链接