Demo gist for react-native-crosswalk-webview javascript execute question

Demo.js

// Main.js

...
<View style={{height:800}}>
  <TouchableHighlight onPress={ this.inj }>
    <Text>Fire</Text>
  </TouchableHighlight>
  <CrosswalkWebView
    source = {{ uri:'http://url.any.com' }}
        javaScriptEnabled={true}
        domStorageEnabled={true}
        style={{marginTop:20,height:500}}
        injectedJavaScript={`setTimeout(function(){window.postMessage("HHHHHHH")},2000)`}
        ref={ (webview) => { this.webview = webview } }
        onMessage={ this.messageHandler }
     />
</View>
...
inj = () => {
  this.refs.webview.postMessage('TEST')
}

onMessage = (str) => {
  console.log('message from webview',str)
}

// index.html <script>
window.onMessage(function(infoStr){
  console.log(infoStr)
})