CountQueuingStrategy：highWaterMark 属性

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.

只读属性 CountQueuingStrategy.highWaterMark 返回在应用背压之前，内置队列可以包含的分块总数。

值

一个整数，表示分块的数量。

示例

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

const readableStream = new ReadableStream(
  {
    start(controller) {
      // …
    },
    pull(controller) {
      // …
    },
    cancel(err) {
      console.log("stream error:", err);
    },
  },
  queuingStrategy,
);

const size = queuingStrategy.size(chunk);
console.log(`highWaterMark value: ${queuingStrategy.highWaterMark}$`);

规范

Specification
Streams Standard
# ref-for-cqs-high-water-mark①

浏览器兼容性

BCD tables only load in the browser

参见