本地存储最佳分数未定义/无值

Question

if (typeof localStorage["BestScore"] === 'undefined') {
    localStorage["BestScore"] = 0;
    var maxScore=0;
}     
else {
    var maxScore= localStorage["BestScore"] 
}

此代码尝试检查本地存储最佳分数是否为undefined/no value，如果是，则将maxscore设置为0如果它具有值，则将maxscore设置为该值。出于某种原因，这段代码无效，请帮助。

Answer 1

这就是我使用的。首先检查存储是否可行，然后检查您的对象是否存在。所以...

if (typeof (Storage) !== "undefined") {
    if (!localStorage.BestScore) {
        localStorage.BestScore = 0;
    }

    var maxScore = localStorage.BestScore; 
}

Answer 2

你错过了一个;在第6行。

if (typeof localStorage["BestScore"] === 'undefined') {
  localStorage["BestScore"] = 0;
  var maxScore=0;
}else {
  var maxScore= localStorage["BestScore"] ;
}