Node.js Stream 可写可写长度属性
原文:https://www . geesforgeks . org/node-js-stream-write-writablelength-property/
可写可写长度属性是流模块的内置应用，用于检查队列中准备写入的字节数。
语法:
writable.writableLength
返回值:该属性返回准备写入队列的字节数。
下面的例子说明了在 Node.js 中可写可写长度属性的使用:
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
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
这里，数据“hi”不再存在于缓冲器中，因此，缓冲器只有 3 个字节存在，数据“GFG”需要 3 个字节。
参考:https://nodejs . org/API/stream . html # stream _ writable _ writablelength
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