节点. js 流可写.已破坏属性
原文:https://www . geesforgeks . org/node-js-stream-written-destroy-property/
可写.销毁属性是 Stream 模块的内置应用编程接口，用于检查可写.销毁()方法是否被调用。
语法:
writable.destroyed
返回值:如果在调用 destroy()方法之前调用了该方法，则该属性返回 true，否则返回 false。
下面的例子说明了在 Node.js 中可写的.销毁属性的使用:
例 1:
// Node.js program to demonstrate the
// writable.distroyed 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('hello');
// Calling destroy function
writable.destroy();
// Calling the Property
writable.destroyed;
输出:
hi
hello
true
例 2:
// Node.js program to demonstrate the
// writable.distroyed 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('hello');
// Calling the Property
writable.destroyed;
输出:
hi
hello
false
在上面的示例中，输出为 false，因为在调用属性 writable.destroy 之前没有调用可写. destroy() 方法。
参考:https://nodejs . org/API/stream . html # stream _ written _ destroled
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