From de00dc246ee0b35c26f73a6a65f562ad2b2f7818 Mon Sep 17 00:00:00 2001
From: Jet <390715001@qq.com>
Date: Tue, 26 Sep 2017 10:14:24 +0800
Subject: [PATCH] =?UTF-8?q?Math.trunc()=E5=92=8CMath.sign()=20=E8=A1=A5?=
 =?UTF-8?q?=E5=85=85=E4=BA=86=E5=87=A0=E4=B8=AA=E4=BE=8B=E5=AD=90?=
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Math.sign()  //NaN
Math.sign("")  //0
等等
---
 docs/number.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/docs/number.md b/docs/number.md
index a5f4e15..6a0be7a 100644
--- a/docs/number.md
+++ b/docs/number.md
@@ -333,6 +333,12 @@ Math.trunc(-0.1234) // -0
 ```javascript
 Math.trunc('123.456')
 // 123
+Math.trunc(true)
+//1
+Math.trunc(false)
+0
+Math.trunc(null)
+0
 ```
 
 对于空值和无法截取整数的值，返回NaN。
@@ -341,6 +347,7 @@ Math.trunc('123.456')
 Math.trunc(NaN);      // NaN
 Math.trunc('foo');    // NaN
 Math.trunc();         // NaN
+Math.trunc(undefined) // NaN
 ```
 
 对于没有部署这个方法的环境，可以用下面的代码模拟。
@@ -372,6 +379,11 @@ Math.sign(NaN) // NaN
 Math.sign('9'); // +1
 Math.sign('foo'); // NaN
 Math.sign();      // NaN
+Math.sign("");         //0
+Math.sign(true);       //+1
+Math.sign(false);      //0
+Math.sign(null);       //0
+Math.sign(undefined);  //NaN
 ```
 
 对于没有部署这个方法的环境，可以用下面的代码模拟。