Storage.key()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Storage 接口的 key() 方法,当传递一个数字 n 时,返回给定存储对象中第 n 个键的名称。键的顺序取决于用户代理,所以你不应该依赖它。

语法

js
key(index)

参数

index

一个整数,表示要获取的键名索引。这是一个从零开始的索引。

返回值

包含键名称的字符串。如果索引不存在,则返回 null

示例

下面的函数遍历本地存储键:

js
function forEachKey(callback) {
  for (let i = 0; i < localStorage.length; i++) {
    callback(localStorage.key(i));
  }
}

下面的函数遍历本地存储键,并获得每个键的设定值:

js
for (let i = 0; i < localStorage.length; i++) {
  console.log(localStorage.getItem(localStorage.key(i)));
}

备注: 有关实际运行的例子,详见 Web Storage 演示

规范

Specification
HTML
# dom-storage-key-dev

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
key

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

相关链接