在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

clearMarks() method removes the named mark from the browser's performance entry buffer. If the method is called with no arguments, all performance entries 采用 entry type of " mark " will be removed from the performance entry buffer.

注意： 此特征可用于 Web 工作者 .

句法

performance.clearMarks();
performance.clearMarks(name);
					

自变量

名称 可选

DOMString representing the name of the timestamp. If this argument is omitted, all performance entries 采用 entry type of " mark " will be removed.

返回值

void

范例

The following example shows both uses of the clearMarks() 方法。

// Create a small helper to show how many PerformanceMark entries there are.
function logMarkCount() {
  console.log(
    "Found this many entries: " + performance.getEntriesByType("mark").length
  );
}
// Create a bunch of marks.
performance.mark("squirrel");
performance.mark("squirrel");
performance.mark("monkey");
performance.mark("monkey");
performance.mark("dog");
performance.mark("dog");
logMarkCount() // "Found this many entries: 6"
// Delete just the "squirrel" PerformanceMark entries.
performance.clearMarks('squirrel');
logMarkCount() // "Found this many entries: 4"
// Delete all of the PerformanceMark entries.
performance.clearMarks();
logMarkCount() // "Found this many entries: 0"
					

规范

规范	状态	注释
User Timing Level 2 The definition of 'clearMarks()' in that specification.	工作草案	Clarifies clearMarks() .
User Timing The definition of 'clearMarks()' in that specification.	推荐	Basic 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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
clearMarks	Chrome 29 29 25 — 29 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 41	IE 10	Opera 33	Safari 11	WebView Android ≤37 ≤37 ≤37 — ≤37 Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 29 29 25 — 29 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 42	Opera Android 33	Safari iOS 11	Samsung Internet Android 2.0 2.0 1.5 — 2.0 Prefixed Prefixed Implemented with the vendor prefix: webkit

图例

完整支持

完整支持

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

元数据

• 最后修改： Apr 4, 2019

相关话题

1. 性能
2. 特性

   1. navigation
   2. onresourcetimingbufferfull
   3. timeOrigin
   4. timing
3. 方法

   1. clearMarks()
   2. clearMeasures()
   3. clearResourceTimings()
   4. getEntries()
   5. getEntriesByName()
   6. getEntriesByType()
   7. mark()
   8. measure()
   9. now()
   10. setResourceTimingBufferSize()
   11. toJSON()
4. 事件

   1. resourcetimingbufferfull
5. Related pages for User Timing API

   1. PerformanceEntry
   2. PerformanceMark
   3. PerformanceMeasure