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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

key() 方法在 存储 interface, when passed a number n, returns the name of the nth key in a given 存储 object. The order of keys is user-agent defined, so you should not rely on it.

句法

var aKeyName = storage.key(index);
					

参数

index

An integer representing the number of the key you want to get the name of. This is a zero-based index.

返回值

A DOMString containing the name of the key. If the index does not exist, null 被返回。

范例

The following function iterates over the local storage keys:

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

The following function iterates over the local storage keys and gets the value set for each key:

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

注意 : For a real world example, see our Web 存储演示 .

规范

规范	状态	注释
HTML 实时标准 The definition of 'Storage.key' in that specification.	实时标准

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
key	Chrome 4	Edge 12	Firefox 3.5	IE 8	Opera 10.5	Safari 4	WebView Android Yes	Chrome Android 18	Firefox Android 6	Opera Android 11	Safari iOS 3.2	Samsung Internet Android 1.0

图例

完整支持

完整支持

另请参阅

• 使用 Web 存储 API

元数据

• 最后修改： Jun 3, 2019

相关话题

1. Web 存储 API
2. 存储
3. 特性

   1. length
4. 方法

   1. clear()
   2. getItem()
   3. key()
   4. removeItem()
   5. setItem()
5. Related pages for Web Storage API

   1. StorageEvent
   2. Window.localStorage
   3. Window.sessionStorage