javascript - 如何清除localStorage？ (JavaScript/jQuery)

Question

我目前正在我的本地机器上进行测试，所以当用户按下 Sign out

时，URL 如下所示

// The ********** is my site name, which i don't want releasing yet
http://localhost:8080/**********/logout/

本地存储项:

Key: tkn Value: EE8D9DA0F1D71A0BE8B80F3BA80343555655871151tk16

我尝试过以下测试:

if (localStorage.getItem('tkn')) {
    localStorage.clear();
} 

if (localStorage.getItem('tkn')) {
    localStorage.removeItem('tkn');
} 

// I've also ran these both tests in the console of the browser 
// and they return back 'undefined' but the item is cleared.

但是，当我注销 时，用户 session 已完全删除。但是 localStorage 似乎没有被清除。

有人可以帮我解释一下吗？

Answer 1

不是检查特定属性，而是检查长度

if (localStorage.length > 0 ) {
    localStorage.clear();
} 

localStorage 是 Storage 的一个实现接口(interface)和存储有一个 property称为长度

Storage.length

Returns an integer representing the number of data items stored in the Storage object.