为什么 {highscorelist} 没有价值？

Question

const HIGHSCOREKEY = "highscore";

highscorelist = localStorage.getItem(HIGHSCOREKEY);
if(highscorelist){
    highscorelist = {
        one: {navn: "AAA", score: 0},
        two: {navn: "AAA", score: 0},
        three: {navn: "AAA", score: 0}
    };
    localStorage.setItem(HIGHSCOREKEY, JSON.stringify(highscorelist));
};

这是它的代码，当我尝试执行“highscorelist.one.score”时，它说：“未捕获的类型错误：无法读取 属性 'one' of null”

Answer 1

localStorage.setItem(HIGHSCOREKEY, JSON.stringify(highscorelist));等同于localStorage.setItem(HIGHSCOREKEY, highscorelist);，因为localStorage会以字符串的形式存储。

所以在检索数据时做

highscorelist = JSON.parse(localStorage.getItem(HIGHSCOREKEY));