Node.js Stream 可读. pause()方法
原文:https://www . geesforgeks . org/node-js-stream-readable-pause-method/
readable.pause()方法是 Stream 模块的内置应用编程接口，用于阻止流动模式发出‘数据’事件。如果任何变得可访问的数据将继续存在于内部缓冲区中。
语法:
readable.pause()
参数:此方法不接受任何参数。
返回值:如果使用此方法，则此时暂停读取数据。
下面的例子说明了 readable.pause()方法在 Node.js 中的使用:
例 1:
// Node.js program to demonstrate the
// readable.pause() method
// Including fs module
const fs = require('fs');
// Constructing readable stream
const readable = fs.createReadStream("input.txt");
readable.on('data', (chunk) => {
console.log(`${chunk}`);
});
// Calling pause method
readable.pause();
// Checking if paused or not
readable.isPaused();
输出:
true
例 2:
// Node.js program to demonstrate the
// readable.pause() method
// Include fs module
const fs = require('fs');
// Create readable stream
const readable = fs.createReadStream("input.txt");
// Handling data event
readable.on('data', (chunk) => {
console.log(`Received ${chunk.length} bytes of data.`);
// Calling pause method
readable.pause();
// After this any data will be displayed
// after 1 sec.
console.log('No further data will be displayed for 1 second.');
// Using setTimeout function
setTimeout(() => {
console.log('Now data starts flowing again.');
readable.resume();
}, 1000);
});
// Displays that program
// is ended
console.log("Program ends!!");
输出:
Program ends!!
Received 5 bytes of data.
No further data will be displayed for 1 second.
Now data starts flowing again.
但是，您可以在运行时看到，在执行 pause()方法后，1 秒钟内不会显示更多数据。
参考:https://nodejs.org/api/stream.html#stream_readable_pause。
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