检查localStorage是否可用

问题描述

我知道有关于检查 localStorage 的许多问题，但是如果有人在浏览器中手动关闭它呢？这是我用来检查的代码：

I know there has been many questions about checking for localStorage but what if someone manually shuts it off in their browser? Here's the code I'm using to check:

localStorage.setItem('mod', 'mod');
if (localStorage.getItem('mod') != null){
    alert ("yes");
    localStorage.removeItem('mod');
}else{
    alert ("no");
}

简单的功能，它的工作原理。但是，如果我进入我的Chrome设置并选择不要保存数据选项（我不记得它的名字），当我尝试运行这个函数时，只有未捕获的错误：SecurityError：DOM异常18 。那么有没有办法检查这个人是否完全关闭？

Simple function and it works. But if I go into my Chrome settings and choose the option "Don't Save Data" (I don't remember exactly what it's called), when I try to run this function I get nothing but Uncaught Error: SecurityError: DOM Exception 18. So is there a way to check if the person has it turned off completely?

更新：这是我尝试的第二个功能，我仍然没有得到响应（警报）。

UPDATE: This is the second function I tried and I still get no response (alert).

try {
 localStorage.setItem("name", "Hello World!");
} catch (e) {
 if (e == QUOTA_EXCEEDED_ERR) {
     alert('Quota exceeded!');
}
}

推荐答案

使用的方法（您可能希望将我的功能名称更改为更好）：

Use modernizr's approach (you might want to change my function name to something better):

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

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

它不像其他方法那样简洁，但这是因为它旨在最大限度地实现兼容性。

It's not as concise as other methods but that's because it's designed to maximise compatibility.

原始来源：

工作示例：

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