From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../connectstart/index.html | 81 ++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 files/ja/web/api/performanceresourcetiming/connectstart/index.html (limited to 'files/ja/web/api/performanceresourcetiming/connectstart') diff --git a/files/ja/web/api/performanceresourcetiming/connectstart/index.html b/files/ja/web/api/performanceresourcetiming/connectstart/index.html new file mode 100644 index 0000000000..b54f982218 --- /dev/null +++ b/files/ja/web/api/performanceresourcetiming/connectstart/index.html @@ -0,0 +1,81 @@ +--- +title: PerformanceResourceTiming.connectStart +slug: Web/API/PerformanceResourceTiming/connectStart +tags: + - API + - Web パフォーマンス + - プロパティ + - リファレンス +translation_of: Web/API/PerformanceResourceTiming/connectStart +--- +
{{APIRef("Resource Timing API")}}
+ +

connectStart 読み取り専用プロパティは、リソースを取得するためにユーザエージェントがサーバへの接続の確立を開始する直前に {{domxref("DOMHighResTimeStamp","timestamp")}} を返します。

+ +

{{AvailableInWorkers}}

+ +

構文

+ +
resource.connectStart;
+
+ +

戻り値

+ +

ブラウザがリソースを取得するためにサーバーへの接続を確立し始める直前の {{domxref("DOMHighResTimeStamp")}}。

+ +

+ +

次の例では、すべての "resource" {{domxref("PerformanceEntry.entryType","type")}} イベントの *Start プロパティと *End プロパティの値が記録されます。

+ +
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");
+    }
+  }
+}
+
+ +

仕様

+ + + + + + + + + + + + + + +
仕様書ステータスコメント
{{SpecName('Resource Timing', '#widl-PerformanceResourceTiming-connectStart', 'connectStart')}}{{Spec2('Resource Timing')}}初期定義
+ +

ブラウザの互換性

+ + + +

{{Compat("api.PerformanceResourceTiming.connectStart")}}

-- cgit v1.2.3-54-g00ecf