writable.cork()方法用于強(qiáng)制所有寫入的數(shù)據(jù)緩沖在內(nèi)存中。只有在調(diào)用stream.uncork()或stream.end()方法后，緩沖數(shù)據(jù)才會(huì)從緩沖存儲(chǔ)器中刪除。
語(yǔ)法
cork()
writeable.cork()
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開(kāi)塞()
writeable.uncork()
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參數(shù)
因?yàn)樗彌_寫入的數(shù)據(jù)。唯一需要的參數(shù)將是可寫數(shù)據(jù)。
示例
創(chuàng)建一個(gè)名為 cork.js 的文件并復(fù)制以下代碼片段。創(chuàng)建文件后，使用以下命令運(yùn)行此代碼，如下例所示 –
node cork.js
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cork.js
?現(xiàn)場(chǎng)演示
// Program to demonstrate writable.cork() method
const stream = require('stream');
// Creating a data stream with writable
const writable = new stream.Writable({
// Writing the data from stream
write: function(chunk, encoding, next) {
// Converting the data chunk to be displayed
console.log(chunk.toString());
next();
}
});
// Writing data
writable.write('Hi - This data is printed');
// Calling the cork() function
writable.cork();
// Again writing some data
writable.write('Welcome to TutorialsPoint !');
writable.write('SIMPLY LEARNING ');
writable.write('This data will be corked in the memory');
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輸出
C:\homeode>> node cork.js Hi - This data is printed
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只有在 cork() 方法之間寫入的數(shù)據(jù)才會(huì)被打印，而其余數(shù)據(jù)將被塞入緩沖存儲(chǔ)器中。下面的示例展示了如何從緩沖區(qū)內(nèi)存中解鎖上述數(shù)據(jù)。
示例
讓我們?cè)倏匆粋€(gè)有關(guān)如何 uncork() 的示例 – uncork.js
?現(xiàn)場(chǎng)演示
// Program to demonstrate writable.cork() method
const stream = require('stream');
// Creating a data stream with writable
const writable = new stream.Writable({
// Writing the data from stream
write: function(chunk, encoding, next) {
// Converting the data chunk to be displayed
console.log(chunk.toString());
next();
}
});
// Writing data
writable.write('Hi - This data is printed');
// Calling the cork() function
writable.cork();
// Again writing some data
writable.write('Welcome to TutorialsPoint !');
writable.write('SIMPLY LEARNING ');
writable.write('This data will be corked in the memory');
// Flushing the data from buffered memory
writable.uncork()
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輸出
C:\homeode>> node uncork.js Hi - This data is printed Welcome to TutorialsPoint ! SIMPLY LEARNING This data will be corked in the memory
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使用 uncork() 方法刷新緩沖內(nèi)存后，就會(huì)顯示上面示例中的完整數(shù)據(jù)。
以上就是Node.js 中的 Stream writable.cork() 和 uncork() 方法的詳細(xì)內(nèi)容，更多請(qǐng)關(guān)注www.92cms.cn其它相關(guān)文章！
