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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

setItem() 方法在 存储 interface, when passed a key name and value, will add that key to the given 存储 object, or update that key's value if it already exists.

句法

storage.setItem(keyName, keyValue);
					

参数

keyName

DOMString containing the name of the key you want to create/update.

keyValue

DOMString containing the value you want to give the key you are creating/updating.

返回值

undefined .

异常

setItem() may throw an exception if the storage is full. Particularly, in Mobile Safari (since iOS 5) it always throws when the user enters private mode. (Safari sets the quota to 0 bytes in private mode, unlike other browsers, which allow storage in private mode using separate data containers.) Hence developers should make sure to always catch possible exceptions from setItem() .

范例

The following function creates three data items inside local storage.

function populateStorage() {
  localStorage.setItem('bgcolor', 'red');
  localStorage.setItem('font', 'Helvetica');
  localStorage.setItem('image', 'myCat.png');
}
					

注意 : To see this used within 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.setItem' 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
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

• Storage.getItem()
• Storage.removeItem()
• 使用 Web 存储 API

元数据

• 最后修改： 2019 年 3 月 23 日

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