writable.destroyed属性是Stream模块的内置应用程序编程接口,用于检查writable.destroy()方法是否被调用。
用法:
writable.destroyed
返回值:如果在调用writable.destroy()方法之前,此属性返回true,否则它返回false。
以下示例说明了Node.js中writable.destroyed属性的用法:
范例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
范例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,可写的输出为false。调用属性writable.destroyed之前未调用destroy()方法。
参考: https://nodejs.org/api/stream.html#stream_writable_destroyed
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