files/zh-cn/web/api/workerglobalscope/self/index.html


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---
title: WorkerGlobalScope.self
slug: Web/API/WorkerGlobalScope/self
translation_of: Web/API/WorkerGlobalScope/self
---
<div>{{APIRef("Web Workers API")}}</div>

<p><code><strong>self</strong></code> 是 {{domxref("WorkerGlobalScope")}} 的只读属性，它指向 <code>WorkerGlobalScope</code> 自身。通常情况下，它是如 {{domxref("DedicatedWorkerGlobalScope")}},  {{domxref("SharedWorkerGlobalScope")}}, 或 {{domxref("ServiceWorkerGlobalScope")}} 类型的 scope 。</p>

<h2 id="语法">语法</h2>

<pre class="brush: js">var selfRef = self;</pre>

<h3 id="值">值</h3>

<p>当前 worker 的全局 scope （值取决于你创建的 worker 类型）。</p>

<h2 id="示例">示例</h2>

<p>在 worker 中运行这行代码：</p>

<pre class="brush: js">console.log(self);</pre>

<p>console 中会输出当前 worker 的全局 scope，如下所示：</p>

<pre class="brush: js">DedicatedWorkerGlobalScope {
undefined: undefined, Infinity: Infinity, Math: MathConstructor, NaN: NaN, Intl: Object…}
    Infinity: Infinity
    Array: function Array() { [native code] }
      arguments: null
      caller: null
      isArray: function isArray() { [native code] }
      length: 1
      name: "Array"
      observe: function observe() { [native code] }
      prototype: Array[0]
      unobserve: function unobserve() { [native code] }
      __proto__: function Empty() {}
      &lt;function scope&gt;
    ArrayBuffer: function ArrayBuffer() { [native code] }
    Blob: function Blob() { [native code] }
    Boolean: function Boolean() { [native code] }
    DataView: function DataView() { [native code] }
    Date: function Date() { [native code] }
    DedicatedWorkerGlobalScope: function DedicatedWorkerGlobalScope() { [native code] }
    Error: function Error() { [native code] }
<em>// etc. etc.</em>
</pre>

<p>这会列出当前 worker scope 上完整的属性列表，在需要检测某个属性是否可用时非常有用。 详细列表也可查阅 <a href="/zh-CN/docs/Web/API/Worker/Functions_and_classes_available_to_workers">Functions and classes available to Web Workers</a>.</p>

<h2 id="规范">规范</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('HTML WHATWG', '#dom-workerglobalscope-self', 'self')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="兼容性">兼容性</h2>

<p> </p>


<p>{{Compat("api.WorkerGlobalScope.self")}}</p>

<p> </p>

<h2 id="参见">参见</h2>

<p>{{domxref("WorkerGlobalScope")}}</p>