writable.writableLength属性是流模块的内置应用程序,用于检查队列中准备好写入的字节数。
用法:
writable.writableLength
返回值:此属性返回准备写入队列的字节数。
以下示例说明了Node.js中writable.writableLength属性的用法:
范例1:
// Node.js program to demonstrate the
// writable.writableLength Property
// Accessing stream module
const stream = require('stream');
// Creating a stream and creating
// a write function
const writable = new stream.Writable({
// Write function with its
// parameters
write:function(chunk, encoding, next) {
// Converting the chunk of
// data to string
console.log(chunk.toString());
next();
}
});
// Calling cork() function
writable.cork();
//Writing data
writable.write('hi');
// Again writing some data
writable.write('GFG');
// Calling writable.writableLength
// Property
writable.writableLength;
输出:
5
范例2:
// Node.js program to demonstrate the
// writable.writableLength Property
// Accessing stream module
const stream = require('stream');
// Creating a stream and creating
// a write function
const writable = new stream.Writable({
// Write function with its
// parameters
write:function(chunk, encoding, next) {
// Converting the chunk of
// data to string
console.log(chunk.toString());
next();
}
});
// Calling cork() function
writable.cork();
//Writing data
writable.write('hi');
// Calling uncork() function
writable.uncork();
// Again calling cork function
writable.cork();
// Again writing some data
writable.write('GFG');
// Calling writable.writableLength
// Property
writable.writableLength;
输出:
hi 3
在这里,数据“ hi”不再存在于缓冲区中,因此,缓冲区中只有3个字节存在的数据,“ GFG”需要3个字节。
参考: https://nodejs.org/api/stream.html#stream_writable_writablelength
相关用法
- 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 readable.destroyed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 writable.writableLength 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。