修复错误，补全基本功能#20

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Nutlee wants to merge 6 commits into

xfhxbb:masterfrom

Commits on Aug 30, 2016

1.增加点击空白处控件消失 2.init方法力可以初始化回调函数，同时取到两个值 3. init后return this
Nutlee
committed

Commits on Sep 6, 2016

1. 增加成功后回调 2. 增加点击空白处收起控件 2. 增加 return this
Nutlee
committed

Commits on Dec 29, 2016