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Merge pull request #136 from jackchess/patch-1

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e<sub>x<sub> to e<sup>x<sup>
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Ruan YiFeng 2016-02-03 08:56:50 +08:00
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@ -512,7 +512,7 @@ ES6新增了4个对数相关方法。
**（1） Math.expm1()**
`Math.expm1(x)`返回e<sub>x</sub> - 1，即`Math.exp(x) - 1`。
`Math.expm1(x)`返回e<sup>x</sup> - 1，即`Math.exp(x) - 1`。
```javascript
Math.expm1(-1); // -0.6321205588285577