Node.js zlib.deflate()方法
原文:https://www.geeksforgeeks.org/node-js-zlib-deflate-method/
zlib.deflate()方法是 zlib 模块的内置应用编程接口，用于压缩一大块数据。
语法:
zlib.deflate( buffer, options, callback )
参数:该方法接受三个参数，如上所述，如下所述:
- Buffer: the type can be buffer, type line, data view, array buffer and string. *option: is an optional parameter for saving zlib options. Callback: It holds the callback function.*
*返回值:*返回压缩后的数据块。
以下示例说明了 Node.js 中 zlib.deflate()方法的使用:
*例 1:*
**```js // Node.js program to demonstrate the // deflate() method
// Including zlib module const zlib = require("zlib");
// Declaring input and assigning // it a value string var input = "Geeks";
// Calling deflate method zlib.deflate(input, (err, buffer) => {
if (!err) {
console.log(buffer.toString('base64')); } else { console.log(err); } }); console.log("Data Compressed..."); ```**
*输出:*
Data Compressed...
eJxzT03NLgYABXQB8A==
*例 2:*
**```js // Node.js program to demonstrate the // deflate() method
// Including zlib module const zlib = require("zlib");
// Declaring input and assigning // it a value string var input = "Geeks";
// Calling deflate method zlib.deflate(input, (err, buffer) => {
if (!err) {
console.log(buffer.toString('bas64')); } else { console.log(err); } }); console.log("Data Compressed..."); ```**
*输出:*
Data Compressed...
buffer.js:631
throw new ERR_UNKNOWN_ENCODING(encoding);
^
TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: bas64
at stringSlice (buffer.js:631:9)
at Buffer.toString (buffer.js:667:10)
at Deflate.zlib.deflate [as cb]
(/home/runner/BeautifulMiserlySourcecode/index.js:17:24)
at Deflate.zlibBufferOnEnd (zlib.js:133:10)
at Deflate.emit (events.js:203:15)
at Deflate.EventEmitter.emit (domain.js:448:20)
at endReadableNT (_stream_readable.js:1143:12)
at process._tickCallback (internal/process/next_tick.js:63:19)
在这里，对数据进行编码时会发生错误，因此会引发错误。
*参考:*T2【https://nodejs . org/API/zlib . html # zlib _ zlib _ deflate _ buffer _ options _ callback
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