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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/ja/web/api/performanceresourcetiming/connectstart | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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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 +--- +<div>{{APIRef("Resource Timing API")}}</div> + +<p><strong><code>connectStart</code></strong> 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。</p> + +<p>{{AvailableInWorkers}}</p> + +<h2 id="Syntax" name="Syntax">構文</h2> + +<pre class="syntaxbox"><em>resource</em>.connectStart; +</pre> + +<h3 id="Return_Value" name="Return_Value">戻り値</h3> + +<p>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")}}。</p> + +<h2 id="例">例</h2> + +<p>次の例では、すべての "<code>resource</code>" {{domxref("PerformanceEntry.entryType","type")}} イベントの <code>*Start</code> プロパティと <code>*End</code> プロパティの値が記録されます。</p> + +<pre class="brush: js">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"); + } + } +} +</pre> + +<h2 id="仕様">仕様</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">仕様書</th> + <th scope="col">ステータス</th> + <th scope="col">コメント</th> + </tr> + <tr> + <td>{{SpecName('Resource Timing', '#widl-PerformanceResourceTiming-connectStart', 'connectStart')}}</td> + <td>{{Spec2('Resource Timing')}}</td> + <td>初期定義</td> + </tr> + </tbody> +</table> + +<h2 id="ブラウザの互換性">ブラウザの互換性</h2> + +<div class="hidden">このページの互換性テーブルは構造化データから生成されます。データに貢献したい場合は <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックして、プルリクエストを送ってください。</div> + +<p>{{Compat("api.PerformanceResourceTiming.connectStart")}}</p> |