概要
PerformanceTiming.requestStart 是一个返回代表一个时刻的 unsigned long long 型只读属性，为浏览器发送从服务器或者缓存获取实际文档的请求之时的 Unix毫秒时间戳。如果传输层在请求开始之后发生错误并且连接被重新打开，则该属性将会被设定为新的请求的相应的值 。
语法
time = performanceTiming.requestStart;
标准
| Specification | Status | Comment |
|---|---|---|
| Navigation Timing PerformanceTiming.requestStart |
Recommendation | Initial definition. |
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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
requestStart | Chrome Full support 6 | Edge Full support 12 | Firefox Full support 7 | IE Full support 9 | Opera Full support 15 | Safari Full support 11 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 7 | Opera Android Full support 14 | Safari iOS Full support 11 | Samsung Internet Android ? |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
参见
- 它属于
PerformanceTiming接口。