Test if localStorage is available

localStorageTest.js

function localStorageTest(){
	var test = 'test';
	try {
		localStorage.setItem(test, test);
		localStorage.removeItem(test);
		return true;
	} catch(e) {
		return false;
	}
}

if(localStorageTest() === true){
	// available
}
else {
	// unavailable
}