Node.js Stream 可写. writablehighwark 属性
原文:https://www . geesforgeks . org/node-js-stream-writteble-writablehighwark-property/
可写.可写高水位线属性是流模块的内置应用编程接口，用于检查创建可写时传递的高水位线值。
语法:
writable.writableHighWaterMark
返回值:如果设置，则返回高水位线的值，否则返回默认值。
以下示例说明了在 Node.js 中可写.可写高水印属性的使用:
例 1:
// Node.js program to demonstrate the
// writable.writableHighWaterMark 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();
}
});
// Writing data
writable.write('hi');
// Again writing some data
writable.write('GFG');
// Calling writable.writableHighWaterMark
// Property
writable.writableHighWaterMark;
输出:
hi
GFG
16384
这里，返回默认值。
例 2:
// Node.js program to demonstrate the
// writable.writableHighWaterMark Property
// Accessing stream module
const stream = require('stream');
// Creating a stream and setting the value
// of the highWaterMark
const writable = new stream.Writable({
highWaterMark: 1234
});
// Calling writable.writableHighWaterMark
// Property
writable.writableHighWaterMark;
输出:
1234
这里，返回在创建可写流时设置的高水位线的值。
参考:https://nodejs . org/API/stream . html # stream _ writable _ writablehighwark
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