writable.writable属性是Stream模块的内置应用程序编程接口,用于检查writable.write()方法是否可以安全调用。
用法:
writable.writable
返回值:如果可以安全地调用writable,则返回true。write()方法否则返回false。
以下示例说明了Node.js中writable.writable属性的使用:
范例1:
// Node.js program to demonstrate the
// writable.writable 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.writable
// Property
writable.writable;
输出:
hi GFG true
范例2:
// Node.js program to demonstrate the
// writable.writable 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 end() method
writable.end();
// Calling writable.writable
// Property
writable.writable;
输出:
hi GFG false
在上面的示例中,输出为false,因为在调用writable.writable属性之前调用了writable.end()方法,因此调用writable.write()方法并不安全,因此输出为false。
参考: https://nodejs.org/api/stream.html#stream_writable_writable
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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.writable 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。