discord.js v13 如何编写代码从MessageCollector中收集首个图片/视频附件

问题诊断 #

• 附件长度判断逻辑错误：Collected.attachments.values() 返回的是迭代器对象，直接用方括号包裹只会得到包含单个迭代器的数组，length 永远为1，无法正确判断是否存在附件。需要用Array.from()将迭代器转换为真实的附件数组再计算长度。
• 链接前缀匹配逻辑错误：startsWith(https://||http://) 写法不符合语法逻辑，JS会先运算||表达式，结果永远返回https://，导致所有http://开头的链接都无法被匹配。需要拆分为两个独立的startsWith判断再用逻辑或连接。
• 代码结构不完整：你提供的代码片段缺失了多层闭合的大括号和圆括号，实际运行会直接抛出语法错误，需补全所有闭合标签。

修复后代码 #

Message.author.send({ embeds: [AttachmentEmbed] }).then(Msg => {
    var Collector = Msg.channel.createMessageCollector({ MessageFilter, max: 1, time: 300000 });
    Collector.on(`collect`, Collected => {
        if (Collected.content.toLowerCase() !== `cancel`) {
            // 迭代器转数组后计算长度
            const attachments = Array.from(Collected.attachments.values());
            console.log(attachments.length);
            if (attachments.length > 0) {
                var Attachment = attachments[0];
                var AttachmentType = `Image`;
                PostApproval(false, Mode, Title, Description, Pricing, Contact, Attachment, AttachmentType);
            // 修正链接前缀判断逻辑
            } else if ((Collected.content.startsWith(`https://`) || Collected.content.startsWith(`http://`)) && !Collected.content.startsWith(`https://cdn.discordapp.com/attachments/`)) {
                var Attachment = Collected.content.split(/[ ]+/)[0];
                var AttachmentType = `Link`;
                PostApproval(false, Mode, Title, Description, Pricing, Contact, Attachment, AttachmentType);
                console.log(Attachment)
            } else if (Collected.content.startsWith(`https://cdn.discordapp.com/attachments/`)) {
                var Attachment = Collected.content.split(/[ ]+/)[0];
                var AttachmentType = `ImageLink`;
                PostApproval(false, Mode, Title, Description, Pricing, Contact, Attachment, AttachmentType);
                console.log(Attachment)
            }
        }
    })
})

内容的提问来源于stack exchange，提问作者DbkboxiMoldoxjZfmebo