CountQueuingStrategy()

Baseline 2022

Newly available

Since June 2022, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

CountQueuingStrategy() 构造函数创建并返回一个 CountQueuingStrategy 对象实例。

语法

new CountQueuingStrategy(highWaterMark)

参数

highWaterMark: 一个包含 highWaterMark 属性的对象。这个属性是一个非负整数，定义了在应用背压之前内部队列包含的分块的总数。

返回值

一个 CountQueuingStrategy 对象实例。

异常

无。

示例

const queuingStrategy = new CountQueuingStrategy({ highWaterMark: 1 });

const writableStream = new WritableStream(
  {
    // Implement the sink
    write(chunk) {
      // …
    },
    close() {
      // …
    },
    abort(err) {
      console.log("Sink error:", err);
    },
  },
  queuingStrategy,
);

const size = queuingStrategy.size();

规范

Specification
Streams Standard # ref-for-cqs-constructor①

浏览器兼容性

BCD tables only load in the browser

参见

CountQueuingStrategy