Storage.clear() - Web API 接口参考 编辑

clear() 是 Storage 接口的一个方法，调用它可以清空存储对象里所有的键值。

语法

storage.clear();

参数

无。

返回值

无。

示例

下面的函数在本地存储里面创建三个数据项，然后使用 clear() 把它们全部移除。

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

  localStorage.clear();
}

备注：一个实际的例子 Web Storage Demo。

规范

Specification	Status	Comment
Unknown clear()	Unknown

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
localStorage	4	3.5	8	10.50	4
sessionStorage	5	2	8	10.50	4

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	2.1	?	8	11	iOS 3.2

各浏览器支持的 localStorage 和 sessionStorage 容量不同。测试页面：detailed rundown of all the storage capacities for various browsers.

Note: since iOS 5.1, Safari Mobile stores localStorage data in the cache folder, which is subject to occasional clean up, at the behest of the OS, typically if space is short.

相关链接

使用 Web Storage API