WorkerGlobalScope.self

self 是 WorkerGlobalScope 的只读属性，它指向 WorkerGlobalScope 自身。通常情况下，它是如 DedicatedWorkerGlobalScope, SharedWorkerGlobalScope, 或 ServiceWorkerGlobalScope 类型的 scope。

语法

js
var selfRef = self;

值

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

示例

在 worker 中运行这行代码：

js
console.log(self);

console 中会输出当前 worker 的全局 scope，如下所示：

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() {}
      <function scope>
    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] }
// etc. etc.

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 Functions and classes available to Web Workers.

规范

Specification
HTML
# dom-workerglobalscope-self-dev

浏览器兼容性

BCD tables only load in the browser

参见

WorkerGlobalScope