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+---
+title: PerformanceEntry.toJSON()
+slug: Web/API/PerformanceEntry/toJSON
+tags:
+  - PerformanceEntry.toJSON()
+translation_of: Web/API/PerformanceEntry/toJSON
+---
+<div>{{APIRef("Performance Timeline API")}}</div>
+
+<p><strong><code>toJSON()</code></strong> 方法是一个串行器( <em>serializer </em>); 它返回{{domxref("PerformanceEntry","performance entry")}}对象的一个JSON表示形式。</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox">const json = perfEntry.toJSON();
+</pre>
+
+<h3 id="Arguments">Arguments</h3>
+
+<dl>
+ <dt>None</dt>
+ <dd> </dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<dl>
+ <dt>json</dt>
+ <dd>A JSON object that is the serialization of the {{domxref("PerformanceEntry")}} object.</dd>
+</dl>
+
+<h2 id="Example">Example</h2>
+
+<p>The following example shows the use of the <code>toJSON()</code> method.</p>
+
+<pre class="brush: js">function run_PerformanceEntry() {
+  log("PerformanceEntry support ...");
+
+  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");
+
+  // Use getEntries() to iterate through the each entry
+  var p = performance.getEntries();
+  for (var i=0; i &lt; p.length; i++) {
+    log("Entry[" + i + "]");
+    check_PerformanceEntry(p[i]);
+  }
+}
+function check_PerformanceEntry(obj) {
+  var properties = ["name", "entryType", "startTime", "duration"];
+  var methods = ["toJSON"];
+
+  for (var i=0; i &lt; properties.length; i++) {
+    // check each property
+    var supported = properties[i] in obj;
+    if (supported)
+      log("..." + properties[i] + " = " + obj[properties[i]]);
+    else
+      log("..." + properties[i] + " = Not supported");
+  }
+  for (var i=0; i &lt; methods.length; i++) {
+    // check each method
+    var supported = typeof obj[methods[i]] == "function";
+    if (supported) {
+      var js = obj[methods[i]]();
+      log("..." + methods[i] + "() = " + JSON.stringify(js));
+    } else {
+      log("..." + methods[i] + " = Not supported");
+    }
+  }
+}
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Performance Timeline Level 2', '#dom-performanceentry', 'toJSON')}}</td>
+   <td>{{Spec2('Performance Timeline Level 2')}}</td>
+   <td>Initial definition of <code>toJSON()</code> method.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+<div>
+
+
+<p>{{Compat("api.PerformanceEntry.toJSON")}}</p>
+</div>
+</div>