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Node.js buffer copy() 方法

❮ Buffer 模块


示例

将一个缓冲区复制到另一个缓冲区的某些部分

var buf1 = Buffer.from('abcdefghijkl');
var buf2 = Buffer.from('HELLO');

buf2.copy(buf1, 2);

console.log(buf1.toString());
运行示例 »

定义和用法

copy() 方法将数据从一个缓冲区对象复制到另一个缓冲区对象。


语法

buffer.copy(target, targetStart, sourceStart, sourceEnd);

参数值

参数 描述
target 必需。要连接的缓冲区数组
targetStart 可选。指定开始复制到的位置的数字。默认为 0
sourceStart 可选。指定开始复制的起始位置的数字。默认为 0
sourceEnd 可选。指定停止复制的结束位置的数字。默认为缓冲区的末尾

技术细节

返回值 指定已复制字节数的数字
Node.js 版本 0.1.90

更多示例

示例

将缓冲区的一部分复制到另一个缓冲区的一部分

var buf1 = Buffer.from('abcdefghijkl');
var buf2 = Buffer.from('HELLO');

buf2.copy(buf1, 2, 0, 2);

console.log(buf1.toString());
运行示例 »

❮ Buffer 模块

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