HTML5 localStorage：我的代码是否遵循正确的标准？

//check if storage is set already, if not set the variable   
function checkLocalStorage(){  
if (localStorage.timesPlayed){  
timesPlayed = Number(localStorage.timesPlayed);  
}   
else{   
timesPlayed = 0;   
}   
}

//code snippet to increase my variable   
timesPlayed += 1;

//code snippet to set the localStorage   
localStorage.timesPlayed = timesPlayed;

getItem

setItem

var won = false;
localStorage.isWinner = won;
if (localStorage.isWinner) { // always true
  alert(\"You won!\");
}

localStorage.test = {foo: \"bar\", dog: \"cat\"};
// returns \"[object Object]\"

localStorage.setItem(\"key\", JSON.stringify(value));
JSON.parse(localStorage.getItem(\"key\"));

// or as a de facto alternative

localStorage.key = JSON.stringify(value);
JSON.parse(localStorage.key);

getItem

setItem