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已废弃
该特性已经从 Web 标准中删除，虽然一些浏览器目前仍然支持它，但也许会在未来的某个时间停止支持，请尽量不要使用该特性。
Window API 的 external 属性返回一个 External 接口的实例, 这个接口应该包含一些向浏览器添加外部搜索提供者( external search providers )相关的函数。但是现在这个属性已经被废弃，并且这些函数现在都是空函数（至少在一些浏览器中是这样的），不做任何功能，仅为了符合标准。
方法
External 对象有以下方法:
| 方法 | 描述 |
|---|---|
AddSearchProvider() |
空函数 |
IsSearchProviderInstalled() |
空函数 |
Specifications
| Specification | Status |
|---|---|
| HTML Living Standard External |
Living Standard |
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.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
External | Chrome Full support Yes | Edge Full support ≤18 | Firefox Full support Yes | IE ? | Opera Full support Yes | Safari ? | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support Yes |
AddSearchProvider | Chrome Full support 54 | Edge Full support ≤79 | Firefox
Full support
Yes
| IE ? | Opera Full support 41 | Safari ? | WebView Android Full support 54 | Chrome Android Full support 54 | Firefox Android Full support Yes | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support 6.0 |
IsSearchProviderInstalled | Chrome Full support 54 | Edge Full support ≤79 | Firefox Full support Yes | IE ? | Opera Full support 41 | Safari ? | WebView Android Full support 54 | Chrome Android Full support 54 | Firefox Android Full support Yes | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support 6.0 |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
- See implementation notes.
- See implementation notes.