Node.js Readable Stream resume事件用法及代码示例

可读流中的 ‘resume’ 事件在调用 stream.resume() 并且 readableFlowing 属性不为真时发出。

用法:

Event:'resume'

返回值：如果 readable.resume() 正在被调用，则它会被发出，否则它不会被发出。

下面的例子说明了在 Node.js 中 resume 事件的使用：

范例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

范例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： https://nodejs.org/api/stream.html#stream_event_resume

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注：本文由纯净天空筛选整理自nidhi1352singh大神的英文原创作品 Node.js | Readable Stream resume Event。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。