performance.getEntriesByName()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2017年9月.
**getEntriesByName()**方法返回一个给定名称和 name 和 type 属性的PerformanceEntry对象数组。在创建 performance 标记或在明确的时间点测量（比如手动调用mark()方法）也可以创建这样的对象数组。
在 Workers 中可以使用该方法。
语法
entries = window.performance.getEntriesByName(name, type);
参数
- name
-
The name of the entry to retrieve.
- type 可选
-
The type of entry to retrieve such as "
mark". The valid entry types are listed inPerformanceEntry.entryType.
Return value
- entries
-
A list of
PerformanceEntryobjects that have the specifiednameandtype. If thetypeargument is not specified, only thenamewill be used to determine the entries to return. The items will be in chronological order based on the entries'startTime. If no objects meet the specified criteria, an empty list is returned.
Example
function use_PerformanceEntry_methods() {
log("PerformanceEntry tests ...");
if (performance.mark === undefined) {
log("... performance.mark Not supported");
return;
}
// Create some performance entries via the mark() method
performance.mark("Begin");
do_work(50000);
performance.mark("End");
performance.mark("Begin");
do_work(100000);
performance.mark("End");
do_work(200000);
performance.mark("End");
// Use getEntries() to iterate through the each entry
var p = performance.getEntries();
for (var i = 0; i < p.length; i++) {
log("Entry[" + i + "]");
check_PerformanceEntry(p[i]);
}
// Use getEntries(name, entryType) to get specific entries
p = performance.getEntries({ name: "Begin", entryType: "mark" });
for (var i = 0; i < p.length; i++) {
log("Begin[" + i + "]");
check_PerformanceEntry(p[i]);
}
// Use getEntriesByType() to get all "mark" entries
p = performance.getEntriesByType("mark");
for (var i = 0; i < p.length; i++) {
log(
"Mark only entry[" +
i +
"]: name = " +
p[i].name +
"; startTime = " +
p[i].startTime +
"; duration = " +
p[i].duration,
);
}
// Use getEntriesByName() to get all "mark" entries named "Begin"
p = performance.getEntriesByName("Begin", "mark");
for (var i = 0; i < p.length; i++) {
log(
"Mark and Begin entry[" +
i +
"]: name = " +
p[i].name +
"; startTime = " +
p[i].startTime +
"; duration = " +
p[i].duration,
);
}
}
Specifications
| Specification |
|---|
| Performance Timeline # dom-performance-getentriesbyname |
Browser compatibility
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