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Node.js Buffer.byteLength() 方法

❮ Buffer 模块


示例

检查缓冲区对象的长度

var buf = Buffer.alloc(15);
var len = Buffer.byteLength(buf);
console.log(len);
运行示例 »

定义和用法

Buffer.byteLength() 方法返回指定字符串对象的长度(以字节为单位)。


语法

 Buffer.byteLength(string, encoding);

参数值

参数 描述
string 必需。指定要计算长度的对象。支持的类型为
字符串
缓冲区
类型化数组
数据视图
数组缓冲区
encoding 可选。如果对象是字符串,则此参数指定其编码。默认编码为“utf8”

技术细节

返回值 指定对象中的字节数
Node.js 版本 0.1.90

更多示例

示例

返回字符串“abc”中的字节数

var len = Buffer.byteLength('abc');
console.log(len);
运行示例 »

❮ Buffer 模块

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