getFileAsync异常处理

var localFolder = Windows.Storage.ApplicationData.current.localFolder;

localFolder.getFileAsync("myfile.data")
.then(function (file) {
return Windows.Storage.FileIO.readTextAsync(file);
}, function (error) {
console.log("Problem reading myfile.data");
createDataModel();
}).done(function (text) {
try {
var activitiesArray = JSON.parse(text);

var activitiesList = new WinJS.Binding.List(activitiesArray);
var publicMembers =
{
itemList: activitiesList
};

WinJS.Namespace.define("DataExample", publicMembers);
} catch (error) {
console.log("Can't read file");
}
});