Readable Stream中的可读.visibleObjectMode属性,用于检查流的objectMode。
用法:
readable.readableObjectMode
返回值:它返回布尔值。
以下示例说明了Node.js中visible.visibleObjectMode属性的使用:
范例1:
// Node.js program to demonstrate the
// readable.readableObjectMode Property
// Accessing readable stream module
const Readable = require('readable-stream').Readable;
// Constructing readable stream and
// setting the objectMode value
const readable = Readable({objectMode:true});
// Defining ._read method
readable._read = () => {};
// Instructions for reading data
readable.on('readable', () => {
let chunk;
// Using while loop and calling
// read method with parameter
while (null !== (chunk = readable.read(4))) {
// Displaying the chunk
console.log(`read:${chunk}`);
}
});
// Calling readableObjectMode
// Property
readable.readableObjectMode;
console.log("objectMode is true!!");
输出:
objectMode is true!!
范例2:
// Node.js program to demonstrate the
// readable.readableObjectMode Property
// Accessing readable stream module
const Readable = require('readable-stream').Readable;
// Constructing readable stream and
// setting the objectMode value
const readable = Readable({objectMode:false});
// Defining ._read method
readable._read = () => {};
// Instructions for reading data
readable.on('readable', () => {
let chunk;
// Using while loop and calling
// read method with parameter
while (null !== (chunk = readable.read(4))) {
// Displaying the chunk
console.log(`read:${chunk}`);
}
});
// Calling readableObjectMode
// Property
readable.readableObjectMode;
console.log("objectMode is false!!");
输出:
objectMode is false!!
参考: https://nodejs.org/api/stream.html#stream_readable_readableobjectmode
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