例如,我有一个字符串 "this=20is=20a=20string",我想将其转换为 "this is a string"。
使用 mimelib:
var mimelib = require("mimelib");
mimelib.decodeQuotedPrintable("this=20is=20a=20string") === "this is a string"
mimelib.decodeMimeWord("=?iso-8859-1?Q?=27text=27?=") === "'text'"
mimelib
现在已经不再维护。 - sebix可以使用quoted-printable package进行引用可打印编码和解码。
> var utf8 = require('utf8')
undefined
> var quotedPrintable = require('quoted-printable');
undefined
> var s = 'this=20is=20a=20string'
undefined
> utf8.decode(quotedPrintable.decode(s))
'this is a string'
> quotedPrintable.encode(utf8.encode('this is a string'))
'this is a string'
function decodeQuotedPrintable(data)
{
// normalise end-of-line signals
data = data.replace(/(\r\n|\n|\r)/g, "\n");
// replace equals sign at end-of-line with nothing
data = data.replace(/=\n/g, "");
// encoded text might contain percent signs
// decode each section separately
let bits = data.split("%");
for (let i = 0; i < bits.length; i ++)
{
// replace equals sign with percent sign
bits[i] = bits[i].replace(/=/g, "%");
// decode the section
bits[i] = decodeURIComponent(bits[i]);
}
// join the sections back together
return(bits.join("%"));
}
这里有一个变量,您可以指定字符集:
function decodeQuotedPrintable(raw, charset='utf-8') {
const dc = new TextDecoder(charset);
return raw.replace(/[\t\x20]$/gm, "").replace(/=(?:\r\n?|\n)/g, "").replace(/((?:=[a-fA-F0-9]{2})+)/g, (m) => {
const cd = m.substring(1).split('='), uArr=new Uint8Array(cd.length);
for (let i = 0; i < cd.length; i++) {
uArr[i] = parseInt(cd[i], 16);
}
return dc.decode(uArr);
});
}
console.log(decodeQuotedPrintable('Freundliche Gr=C3=BCsse')); // "Freundliche Grüsse"
console.log(decodeQuotedPrintable('I love =F0=9F=8D=95')); // "I love "
console.log(decodeQuotedPrintable('Freundliche Gr=FCsse', 'ISO-8859-1')); // "Freundliche Grüsse"
console.log(decodeQuotedPrintable('Freundliche Gr=9Fsse', 'macintosh')); // "Freundliche Grüsse"