Node.js 可读流恢复事件
原文:https://www . geesforgeks . org/node-js-readable-stream-resume-event/
当调用 stream.resume()并且readableflow属性不为真时，会发出可读流中的“resume”事件。
语法:
Event: 'resume'
返回值:如果可读则发出，如果调用 resume()则不发出。
下面的例子说明了恢复事件在 Node.js 中的使用:
例 1:
// Node.js program to demonstrate the
// readable resume event
// Including fs module
const fs = require('fs');
// Constructing readable stream
const readable = fs.createReadStream("input.txt");
// Handling data event
readable.on('data', (chunk) => {
console.log(`${chunk}`);
});
// Calling pause method
readable.pause()
// Calling resume method
readable.resume();
// Handling resume event
readable.on('resume', () => {
console.log("resume emitted!");
});
console.log("Program ends....");
输出:
Program ends....
resume emitted!
GeeksforGeeks
例 2:
// Node.js program to demonstrate the
// readable resume event
// Including fs module
const fs = require('fs');
// Constructing readable stream
const readable = fs.createReadStream("input.txt");
// Handling data event
readable.on('data', (chunk) => {
console.log(`${chunk}`);
// Calling pause method
readable.pause();
// After this any data will be displayed
// after 3 sec.
console.log('No additional data will "
+ "be displayed for 3 seconds.');
// Using setTimeout function
setTimeout(() => {
console.log('Now data starts flowing again.');
// Calling resume method
readable.resume();
// Emitting resume event
readable.on("resume", () => {
console.log("resume emitted!");
});
}, 3000);
});
console.log("Done....");
输出:
Done....
GeeksforGeeks
No additional data will be displayed for 3 seconds.
Now data starts flowing again.
resume emitted!
参考:T2】https://nodejs.org/api/stream.html#stream_event_resume
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