如何使 localStorage 值为 true?

2022-01-19 00:00:00 string boolean local-storage javascript

我想知道 localStorage 是否有可能使用布尔值而不是字符串?

I was wondering if its possible for localStorage to have a Boolean value instead of a string?

如果不可能或可以在 JS 中以不同的方式完成，请仅使用 JS 不使用 JSON，请告诉我，谢谢

Using JS only no JSON if its impossible or can be done in JS a different way please let me know thanks

http://jsbin.com/qiratuloqa/1/

//How to set localStorage "test" to true?

test = localStorage.getItem("test");
localStorage.setItem("test", true); 

if (test === true) {
  alert("works");
} else {
  alert("Broken");
}



/* String works fine.

test = localStorage.getItem("test");
localStorage.setItem("test", "hello"); 

if (test === "hello") {
  alert("works");
} else {
  alert("Broken");
}

*/

推荐答案

我想知道 localStorage 是否可以使用布尔值而不是字符串?

I was wondering if its possible for localStorage to have a Boolean value instead of a string?

不，网络存储 只存储字符串.为了存储更丰富的数据，人们通常在存储时使用 JSON 和 stringify，在检索时使用解析.

No, web storage only stores strings. To store more rich data, people typically use JSON and stringify when storing and parse when retrieving.

存储:

var test = true;
localStorage.setItem("test", JSON.stringify(test));

检索:

test = JSON.parse(localStorage.getItem("test"));
console.log(typeof test); // "boolean"

不过，您不需要 JSON 作为布尔值；您可以只使用 "" 表示 false 和任何其他字符串表示 true，因为 "" 是一个falsey"值(当被视为布尔值时强制为 false 的值).

You don't need JSON for just a boolean, though; you could just use "" for false and any other string for true, since "" is a "falsey" value (a value that coerces to false when treated as a boolean).

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