Storage
接口的 removeItem()
方法,接受一个键名作为参数,会从给定的Storage对象中删除该键名(如果存在)。 如果没有与该给定键名匹配的项,则此方法将不执行任何操作。
语法
storage.removeItem(keyName);
参数
- keyName
- 一个
DOMString
,即你想要移除的键名。
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,然后把 image
数据项移除。
function populateStorage() {
localStorage.setItem('bgcolor', 'red');
localStorage.setItem('font', 'Helvetica');
localStorage.setItem('image', 'myCat.png');
localStorage.removeItem('image');
}
备注:完整的例子,可查看 Web Storage Demo。
规范
Specification | Status | Comment |
---|---|---|
Unknown removeItem() |
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.
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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 大小上限不同。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.