read.destroyed属性是Stream模块的内置应用程序编程接口,用于检查可读性。是否调用destroy()函数。
用法:
readable.destroyed
返回值:如果可读,则返回true.destroy()方法被调用,否则返回false。
以下示例说明了Node.js中read.destroyed属性的使用:
范例1:
// Node.js program to demonstrate the
// readable.destroyed Property
// Include fs module
const fs = require("fs");
// Constructing readable stream
const readable = fs.createReadStream("input.txt");
// Instructions for reading data
readable.on('readable', () => {
let chunk;
// Using while loop and calling
// read method with parameter
while (null !== (chunk = readable.read())) {
// Displaying the chunk
console.log(`read:${chunk}`);
}
});
// Handling error event
readable.on('error', err => {
console.log(err);
});
// Calling destroy method
// with parameter
readable.destroy('error');
// Displays that the stream is
// destroyed
console.log("Stream destroyed");
// Calling readable.destroyed
// Property
readable.destroyed;
输出:
Stream destroyed true error
范例2:
// Node.js program to demonstrate the
// readable.destroyed Property
// Include fs module
const fs = require("fs");
// Constructing readable stream
const readable = fs.createReadStream("input.txt");
// Instructions for reading data
readable.on('readable', () => {
let chunk;
// Using while loop and calling
// read method with parameter
while (null !== (chunk = readable.read())) {
// Displaying the chunk
console.log(`read:${chunk}`);
}
});
// Displays that the stream is
// destroyed
console.log("Program completed!!");
// Calling readable.destroyed
// Property
readable.destroyed;
输出:
Program completed!! false read:hello
因此,在read.destroyed属性之前不会调用read.destroy()方法,因此它返回false。
参考: https://nodejs.org/api/stream.html#stream_readable_destroyed
相关用法
- node.js Stream writable.writableLength用法及代码示例
- node.js Stream writable.destroyed用法及代码示例
- node.js Stream writable.writableEnded用法及代码示例
- node.js Stream writable.writableCorked用法及代码示例
- node.js Stream writable.writableHighWaterMark用法及代码示例
- node.js Stream writable.writableFinished用法及代码示例
- node.js Stream writable.writableObjectMode用法及代码示例
- node.js Stream readable.readable用法及代码示例
- node.js Stream writable.writable用法及代码示例
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 | Stream readable.destroyed Property。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。