Performance.clearResourceTimings() - Web API 接口参考 编辑

The clearResourceTimings() method removes all performance entries with an entryType of "resource" from the browser's performance data buffer and sets the size of the performance data buffer to zero. To set the size of the browser's performance data buffer, use the Performance.setResourceTimingBufferSize() method.

Syntax

performance.clearResourceTimings();

Arguments

void

 

Return value

none

This method has no return value.

Example

function load_resource() {
  var image = new Image();
  image.src = "https://www.wenjiangs.com/wp-content/uploads/2020/mozilla/opengraph-logo.png";
}
function clear_performance_timings() {
  if (performance === undefined) {
    log("Browser does not support Web Performance");
    return;
  }
  // Create a resource timing performance entry by loading an image
  load_resource();

  var supported = typeof performance.clearResourceTimings == "function";
  if (supported) {
    console.log("Run: performance.clearResourceTimings()");
    performance.clearResourceTimings();
  } else {
    console.log("performance.clearResourceTimings() NOT supported");
    return;
  }
  // getEntries should now return zero
  var p = performance.getEntriesByType("resource");
  if (p.length == 0)
    console.log("... Performance data buffer cleared");
  else
    console.log("... Performance data buffer NOT cleared!");
}

Specifications

Browser compatibility

BCD tables only load in the browser