redirectStart
只读特性返回
timestamp
representing the start time of the fetch which that initiates the redirect.
If there are HTTP redirects when fetching the resource and if any of the redirects are not from the same origin as the current document, but the timing allow check algorithm passes for each redirected resource, this property returns the starting time of the fetch that initiates the redirect; otherwise, zero is returned.
注意： 此特征可用于 Web 工作者 .resource.redirectStart;
A
timestamp
representing the start time of the fetch which initiates the redirect.
In the following example, the value of the
*Start
and
*End
properties of all "
resource
"
type
events are logged.
function print_PerformanceEntries() {
// Use getEntriesByType() to just get the "resource" events
var p = performance.getEntriesByType("resource");
for (var i=0; i < p.length; i++) {
print_start_and_end_properties(p[i]);
}
}
function print_start_and_end_properties(perfEntry) {
// Print timestamps of the PerformanceEntry *start and *end properties
properties = ["connectStart", "connectEnd",
"domainLookupStart", "domainLookupEnd",
"fetchStart",
"redirectStart", "redirectEnd",
"requestStart",
"responseStart", "responseEnd",
"secureConnectionStart"];
for (var i=0; i < properties.length; i++) {
// check each property
var supported = properties[i] in perfEntry;
if (supported) {
var value = perfEntry[properties[i]];
console.log("... " + properties[i] + " = " + value);
} else {
console.log("... " + properties[i] + " = NOT supported");
}
}
}
| 规范 | 状态 | 注释 |
|---|---|---|
|
Resource Timing Level 1
The definition of 'redirectStart' in that specification. |
候选推荐 | 初始定义。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
redirectStart
|
Chrome 43 | Edge 12 | Firefox 40 | IE No | Opera 30 | Safari 11 | WebView Android 43 | Chrome Android 43 | Firefox Android 42 | Opera Android 30 | Safari iOS 11 | Samsung Internet Android 4.0 |
完整支持
不支持
PerformanceResourceTiming