test.html

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title>jsPDF customfonts example</title>
    <script language="javascript" type="text/javascript" src="./dist/jspdf.customfonts.min.js"></script>
    <script language="javascript" type="text/javascript" src="./dist/default_vfs.js"></script>
</head>

<body>
    <script>
        var doc = new jsPDF();
    
        doc.addFont('Batang.ttf', 'Batang', 'normal');
        doc.addFont('NotoSansCJKjp-Regular.ttf', 'NotoSansCJKjp', 'normal');
        doc.addFont('NotoSansCJKtc-Regular.ttf', 'NotoSansCJKtc', 'normal');

        doc.setFont('Batang');
        doc.text(15, 15, '안녕하세요 만나서 반갑습니다.');

        doc.setFont('NotoSansCJKjp');
        doc.text(15, 30, 'こんにちは。はじめまして。');

        doc.setFont('NotoSansCJKtc');
        doc.text(15, 45, '早上好。 很高兴见到你');

        //multi-lines Test
        var paragraph = 'Lorem ipsum dolor sit amet, consectetur adipisicing elit,' +
            ' sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.' +
            ' Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris' +
            ' nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor ' +
            'in reprehenderit in voluptate velit esse cillum dolore eu fugiat ' +
            'nulla pariatur. Excepteur sint occaecat cupidatat non proident, ' +
            'sunt in culpa qui officia deserunt mollit anim id est laborum.';
        var lines = doc.splitTextToSize(paragraph, 150);
        doc.text(15, 60, lines);

        doc.save('custom_fonts.pdf');
    </script>
</body>

</html>