Buffer.from(string[, encoding])

• string <string> 要编码的字符串。
• encoding <string> string 的编码。 默认值: 'utf8'。

创建包含 string 的新 Buffer。 encoding 参数标识将 string 转换为字节时要使用的字符编码。

const buf1 = Buffer.from('this is a tést');
const buf2 = Buffer.from('7468697320697320612074c3a97374', 'hex');

console.log(buf1.toString());
// 打印: this is a tést
console.log(buf2.toString());
// 打印: this is a tést
console.log(buf1.toString('latin1'));
// 打印: this is a tést

如果 string 不是字符串或其他适用于 Buffer.from() 变体的类型，则将抛出 TypeError。

• string <string> A string to encode.
• encoding <string> The encoding of string. Default: 'utf8'.

Creates a new Buffer containing string. The encoding parameter identifies the character encoding to be used when converting string into bytes.

const buf1 = Buffer.from('this is a tést');
const buf2 = Buffer.from('7468697320697320612074c3a97374', 'hex');

console.log(buf1.toString());
// Prints: this is a tést
console.log(buf2.toString());
// Prints: this is a tést
console.log(buf1.toString('latin1'));
// Prints: this is a tést

A TypeError will be thrown if string is not a string or another type appropriate for Buffer.from() variants.