在此页

• 特性
• 方法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

存储 接口在 Web 存储 API provides access to a particular domain's session or local storage. It allows, for example, the addition, modification, or deletion of stored data items.

To manipulate, for instance, the session storage for a domain, a call to Window.sessionStorage is made; whereas for local storage the call is made to Window.localStorage .

特性

Storage.length 只读

Returns an integer representing the number of data items stored in the 存储 对象。

方法

Storage.key()

When passed a number n , this method will return the name of the nth key in the storage.

Storage.getItem()

When passed a key name, will return that key's value.

Storage.setItem()

When passed a key name and value, will add that key to the storage, or update that key's value if it already exists.

Storage.removeItem()

When passed a key name, will remove that key from the storage.

Storage.clear()

When invoked, will empty all keys out of the storage.

范例

Here we access a 存储 object by calling localStorage . We first test whether the local storage contains data items using !localStorage.getItem('bgcolor') . If it does, we run a function called setStyles() that grabs the data items using Storage.getItem() and uses those values to update page styles. If it doesn't, we run another function, populateStorage() , which uses Storage.setItem() to set the item values, then runs setStyles() .

if(!localStorage.getItem('bgcolor')) {
  populateStorage();
} else {
  setStyles();
}
function populateStorage() {
  localStorage.setItem('bgcolor', document.getElementById('bgcolor').value);
  localStorage.setItem('font', document.getElementById('font').value);
  localStorage.setItem('image', document.getElementById('image').value);
  setStyles();
}
function setStyles() {
  var currentColor = localStorage.getItem('bgcolor');
  var currentFont = localStorage.getItem('font');
  var currentImage = localStorage.getItem('image');
  document.getElementById('bgcolor').value = currentColor;
  document.getElementById('font').value = currentFont;
  document.getElementById('image').value = currentImage;
  htmlElem.style.backgroundColor = '#' + currentColor;
  pElem.style.fontFamily = currentFont;
  imgElem.setAttribute('src', currentImage);
}
					

注意 : To see this running as a complete working 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' 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
存储	Chrome 4	Edge 12	Firefox 3.5	IE 8	Opera 10.5	Safari 4	WebView Android ≤37	Chrome Android 18	Firefox Android 6	Opera Android 11	Safari iOS 3.2	Samsung Internet Android 1.0
clear	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
getItem	Chrome 4	Edge 12	Firefox 3.5	IE 8	Opera 10.5	Safari 4	WebView Android ≤37	Chrome Android 18	Firefox Android 6	Opera Android 11	Safari iOS 3.2	Samsung Internet Android 1.0
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
length	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
removeItem	Chrome 4	Edge 12	Firefox 3.5	IE 8	Opera 10.5	Safari 4	WebView Android ≤37	Chrome Android 18	Firefox Android 6	Opera Android 11	Safari iOS 3.2	Samsung Internet Android 1.0
setItem	Chrome 4	Edge 12	Firefox 3.5	IE 8	Opera 10.5	Safari 4	WebView Android ≤37	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
• Window.localStorage
• Window.sessionStorage
• CacheStorage

元数据

• 最后修改： Aug 26, 2020

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