Simple implementation about JavaScriptCore
Use JavaScriptCore to push to WebViewController from ViewController and store the value input in webView
1/ In ViewController we have "Call" button which use to call JavaScript code to push to WebViewController
2/ In WebViewController we have a webView with 2 button in content. Their function is save and load the string which stored by NSUserDefaut.
JAVA SCRIPT CORE //Edit for VNese