通过RN的Navigator组件来测试组件的生命周期
index是ios.index.js的生命周期log名称；
first是firstpage.js的生命周期log名称；
second是secondpage.js的生命周期log名称；
third是thirdpage.js的生命周期log名称；
log日志如下：
###开始启动
index init
index componentWillMount is here
index render is here
first init
first componentWillMount is here
first render is here
first componentDidMount is here
index componentDidMount is here
###点击 goto Secondpage
first componentWillReceiveProps is here
first shouldComponentUpdate is here
first componentWillUpdate is here
first render is here
second init
second componentWillMount is here
second render is here
first componentDidUpdate is here
second componentDidMount is here
###点击 goto Thirdpage
second componentWillReceiveProps is here
second shouldComponentUpdate is here
second componentWillUpdate is here
second render is here
third init
third componentWillMount is here
third render is here
second componentDidUpdate is here
third componentDidMount is here
###点击 back
second componentWillReceiveProps is here
second shouldComponentUpdate is here
second componentWillUpdate is here
second render is here
third componentWillUnmount is here
second componentDidUpdate is here
###再次点击 back
first componentWillReceiveProps is here
first shouldComponentUpdate is here
first componentWillUpdate is here
first render is here
second componentWillUnmount is here
first componentDidUpdate is here
###点击 goto Thirdpage
first componentWillReceiveProps is here
first shouldComponentUpdate is here
first componentWillUpdate is here
first render is here
third init
third componentWillMount is here
third render is here
first componentDidUpdate is here
third componentDidMount is here
###又点击 back
first componentWillReceiveProps is here
first shouldComponentUpdate is here
first componentWillUpdate is here
first render is here
third componentWillUnmount is here
first componentDidUpdate is here
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